Food reviews have been a standard feature of WDJ for 22 years, so it’s not a surprise we are asked for dog food recommendations. The inquiries multiply whenever there is any bad news about dog food – and the ongoing mystery about a possible connection between dog diets and a serious heart disease, canine dilated cardiomyopathy (DCM), is definitely bad news.

Depending upon which news outlets you follow, you may be worried about feeding your dog a food that is grain-free, one that contains peas or other legumes, or one that is “boutique” or made with “exotic” ingredients.

If you haven’t been following any of the news, you can catch up by reading our in-depth article by nutrition writer Linda P. Case in the September 2018 issue (“The Heart of the Matter”) and the blog posts on August 2, 2018 (“Please Don’t Panic About the Grain-Free Thing”), August 9, 2018 (“Choosing Dog Foods After The Grain-Free Scare”) and July 16, 2019 (“Update on grain-free diets and DCM cases in dogs”). Suffice to say here that in July 2018, the United States Food & Drug Administration (FDA) announced that it was looking into reports of a possible link between DCM in breeds of dogs that are not considered at genetic risk of the disease and diets containing “peas, lentils, other legume seeds, or potatoes as main ingredients.”

A year later, the FDA published an update to its original announcement, which included detailed data about the cases they were investigating but still offered no guidance regarding how owners could feed their dogs in order to protect them from developing DCM.

We have been analyzing the data that has been released about the diets that were named in the 515 reports being investigated by the FDA. From this analysis, we have developed recommendations that can help you make feeding choices that we believe could protect your dogs from this disease. In the online version of this article, we have included links that will take you to more detailed explanations, should you wish to know more about how we came to our conclusions.

Before we go on, though, please note: Anything you read, including here and in articles written by veterinary nutritionists, is conjecture. No one knows for sure what might explain a link between certain types of diets and DCM in some dogs – or whether there even is a link – although we believe there is.

Is Your Dog at Risk?

It’s important to keep in mind that the vast majority of dogs who are fed the diets named in the FDA’s reports do not develop DCM! On the other hand, we know that there are more cases of DCM than those that have been reported (or even diagnosed). So how concerned should you be?

The risk of diet-related DCM is not the same for all dogs. Certain breeds of dogs (or lines within breeds) are susceptible to DCM due to taurine insufficiency, where the amount of taurine (or its precursors, methionine and cysteine) in the diet is enough for most dogs, but not for them. These breeds include the American Cocker Spaniel, English Setter, Golden Retriever, Labrador Retriever, Newfoundland, and Saint Bernard. If your dog belongs to one of these breeds, then you should be more concerned about what you’re feeding than the average pet owner.

Other breeds are genetically prone to DCM that is not linked to taurine deficiency, including Boxers, Doberman Pinschers, Great Danes, and Irish Wolfhounds. These dogs may be at no greater risk of diet-related DCM, but since we don’t know for sure, owners may want to be more cautious with these breeds than with others.

Large and giant breed dogs are more susceptible to DCM than smaller dogs are. If you have a large dog, you should be more concerned about what you feed than those with small dogs. One of the factors that drew the attention of veterinary cardiologists, however, was seeing DCM in some smaller dogs as well, so even people with small to medium dogs may want to take precautions. Dogs who eat less than would be expected for their size (older or inactive dogs, or those who get too many calories from treats) also may be at increased risk of dietary insufficiencies, including taurine, which might help explain why some small dogs are affected.

Another risk factor is dogs who eat the same food for long periods of time. The initial FDA report stated, “Early reports from the veterinary cardiology community indicate that the dogs consistently ate these foods as their primary source of nutrition for time periods ranging from months to years [emphasis ours].”

The longer you feed the same food, the more likely your dog is to be affected by any nutritional deficiencies or excesses it contains. Those who rotate foods regularly, particularly those who rotate between different brands of foods with different primary ingredients, have less cause for concern than those who always feed the same food to their dogs.

Focus on Taurine

All of our recommendations are based on the assumption that the issue linking diet and DCM is related to taurine deficiency. There are two very good reasons for this. The first is the link between taurine and DCM in cats that was discovered in the 1980s. The second is the link between taurine and DCM in certain dogs being fed lamb and rice diets that first came to light in the 1990s. Because we know that a lack of sufficient taurine or its precursors can cause DCM in otherwise healthy dogs of all breeds and mixed breeds, it appears to be the most likely culprit in this current situation.

Some of the affected dogs in the FDA reports were found to have low blood taurine levels; however, the majority have normal blood taurine levels. Despite this, most dogs diagnosed with what is suspected to be diet-related DCM are given taurine supplementation, regardless of their taurine blood levels, as well as being switched to a different diet and prescribed heart medications. Some dogs improve, others do not. At this time, it’s impossible to know which factors lead to improvement and which are unnecessary.

Until we know more, our recommendations center on avoiding taurine deficiency by increasing the bioavailability of taurine and its precursors, even for dogs who do not appear to be taurine-deficient.

In general, we recommend avoiding the potential at-risk food categories identified below, or at least limiting them to less than half of your dog’s total diet (if you feed more than two types of food). If you cannot avoid these food categories, then we recommend that you look for foods with added taurine, and/or consider supplementing your dog with taurine yourself (see Supplementing Taurine, below), particularly if your dog is at higher risk of developing DCM, as described above.

SIDEBAR: Switching Dog Foods

Food Categories of Concern

We identified 293 different foods in the 515 reports being investigated by the FDA. We looked at the ingredients and guaranteed analysis of each of these foods, and, just as the FDA’s researchers were no doubt doing, looked for patterns or categories of products to study separately.

We identified four categories of products that might be linked to DCM in at least some dogs. All four start with the letter “L,” which can help to remember them.

Legumes. The FDA reported that 93% of all products involved in the reports they were investigating contained peas and/or lentils. Our analysis confirmed that 89% of the reported foods appeared to contain significant amounts of these ingredients (generally appearing before the first fat or in multiple combinations, sometimes with other legumes).

Lamb. Lamb-based diets are a known risk factor for taurine-deficient DCM. Our analysis found that more than 20% of the foods named in the FDA’s reports were lamb-based.

Limited-ingredient. We were a little surprised to find that limited-ingredient diets were also overrepresented in these reports and we therefore consider them another potential risk factor.

Low-protein. Diets with low protein levels are a known risk factor for DCM. Normal-protein diets that rely on plant proteins, such as from legumes, also appear to pose a higher risk.

Let’s look at each of these “L” food categories of concern.

Legume-rich diets

The FDA found that the vast majority of reported products (93%) contained peas and/or lentils. It seems likely that something about peas and lentils is impacting the availability of taurine or its precursors in the body. This could be due to incomplete plant proteins replacing animal proteins, or fiber from peas and lentils blocking absorption of nutrients, or some other anti-nutritional factors we don’t fully understand.

SIDEBAR: The Most Frequently Named Foods in FDA Reports

Peas are a relatively new ingredient whose popularity has exploded in the last 10 years. The fact that so many foods today contain significant amounts of peas (and other legumes) and the increase in the number of dogs that are reportedly developing DCM (especially those in categories not typically associated with this disease) seems significant. Remember, however, that correlation does not equal causation; again, we are speculating, as no one knows the cause at this time.

Legumes are defined as plants whose fruit (seeds) is enclosed in a pod. Legumes found in dog food include peas, lentils, beans (e.g., pinto beans, navy beans, kidney beans, lima beans, fava beans) and chickpeas (garbanzo beans). Pulses, another term commonly used, are the dry, edible seeds of plants in the legume family, including dried peas, beans, lentils and chickpeas. All pulses are legumes but not all legumes are pulses. Because dog foods may contain fresh peas as well as dried, we use “legumes” rather than “pulses” to define this category.

Pulses are high in protein and fiber and low in fat. High-fat legumes such as soybeans and peanuts do not appear to be involved in the DCM issue.

Bottom line on legumes: We recommend avoiding diets with legumes listed high in the ingredient list (before the first fat or oil) or that include several legumes, even if they appear lower in the ingredient list. If you do feed such a diet, it should not have any of the other “L” traits (be lamb-based, limited-ingredient, or contain less than about 30% protein on a dry matter basis [27% as fed, per the guaranteed analysis, for dry foods]). If you feed high-legume foods as a major part of your dog’s diet, look for foods with added taurine, or consider supplementing with taurine yourself.

Lamb-based diets

Nutritionists have known for more than 20 years that certain breeds of dogs were prone to developing DCM when fed lamb and rice diets. Studies indicate this likely has to do with low bioavailability of taurine’s precursors, methionine and cysteine, in lamb meal. Responsible companies began adding taurine to their lamb and rice diets long ago.

Our analysis of foods named in the FDA reports found that more than 20% of these reports involved diets where lamb was the primary meat source; this included several of the foods with the most reports. The FDA’s analysis found lamb was the second-most common animal protein in reported foods (after chicken). Both of these appear to indicate that lamb is overrepresented in the named foods.

We expect that reliable companies already add taurine to their lamb and rice diets. We also would expect that by now they are in the process of adding taurine to their lamb-based diets that also contain legumes.

Bottom line on lamb: We advise avoiding lamb-based diets without added taurine. If you do feed a lamb-based diet, it should not be high in legumes, limited-ingredient, or low in protein. In addition, we would avoid all foods from any company that sells a lamb and rice diet without added taurine (if they hadn’t already been getting that right, we just wouldn’t trust them at all).

Note: We found several diets where lamb meal was listed second in the ingredient list, following a fresh protein such as beef or bison, which was usually the name used on the label. Because dry lamb meal weighs less than fresh meats, these foods contain more lamb than whatever was named first and would be considered lamb-based diets. Pay attention to ingredient lists, not just the name on the package!

Limited-ingredient diets

The first response from a veterinary nutritionist to the initial FDA report about a possible link between diet and DCM warned against “exotic” ingredients, but her list included both lamb and peas, neither of which would be considered exotic these days (see “We Won’t BEG, below). Instead, what we found was an overrepresentation of limited-ingredient diets, many of which contained no ingredients that most people consider exotic. Almost 40% of all reports received by the FDA involved limited-ingredient diets.

The great majority of these diets included peas and/or lentils, but since that was true for all foods, not just limited-ingredient diets, it doesn’t explain why limited-ingredient diets were named in such a large percentage of reports.

We do not recommend feeding limited-ingredient diets to most dogs, as we believe feeding a variety of ingredients is more likely to meet your dog’s nutritional needs. If you feed a limited-ingredient diet due to your dog’s severe food allergies or digestive issues, avoid foods high in legumes or that are lamb-based or relatively low in protein.

As a general rule we also recommend that you avoid feeding most exotic proteins, anything other than beef, chicken, turkey, lamb, and maybe fish. Exotic proteins (such as kangaroo, venison, duck, bison, rabbit, and so on) should be reserved for potential food allergy testing and/or treatment in the future.

Bottom line on limited-ingredient foods: Until we know more, we feel that companies that make limited-ingredient diets should start adding taurine to these foods. If you feel you must feed a limited-ingredient diet that does not include added taurine, we would suggest supplementing your dog with taurine.

One additional note: Kangaroo was the protein used in the single food reported most often to the FDA – Zignature Kangaroo Formula. This food had twice the number of reports (44) as the next food, Acana Singles Lamb & Apple Formula (both limited-ingredient diets). While no research has been done that we’re aware of, it would appear that kangaroo, like lamb, may be associated with low taurine bioavailability.

Low-protein diets

Insufficient dietary protein is a known risk factor for canine DCM. Protein is needed to build lean muscle, and since the heart is a muscle, insufficient protein can also affect the heart.

We found only a small number of reports of very low-protein diets linked to DCM, but most had no other risk factors (no peas or lentils, not lamb-based or limited-ingredient). Several low-protein urinary care and renal prescription diets were reported to the FDA as being possibly linked to DCM. These diets range from 10.9% to 18.1% protein on a dry matter basis (10 to 16% as-fed).

In our opinion, these prescription diets are often fed unnecessarily. In particular, we do not recommend feeding low-protein diets such as Hill’s Prescription Diet u/d to most dogs prone to forming urinary stones, or feeding diets designed for dogs with late-stage kidney disease who are not expected to live very long to dogs with early-stage kidney disease, who may live for years.

The longer a low-protein diet is fed, the more harm it is likely to do. See the section entitled, “The Side Effects of Low-Protein Diets” in “Cast in Stone” (WDJ June 2010), and “When to Say No to Low-Protein” (“A Low-Protein “kidney diet” Is Not Always the Answer,” May 2005) for more information.

In addition, when we looked at all the named diets that did not include peas or lentils, we found a higher percentage of lower-protein diets, and some with mid-level protein but also with plant proteins in the ingredients, such as corn and wheat gluten meals, pea protein, and potato protein.

Plant proteins may be used to replace animal proteins, providing less taurine and its precursors and more fiber and other factors that may interfere with taurine absorption. Avoid foods that contain corn gluten meal or wheat gluten meal; these are poor-quality, incomplete plant proteins primarily found in lower-quality foods. Pea and potato protein may be acceptable if far down in the ingredient list, but we don’t believe they offer much if any nutritional benefit (we’d prefer to see added taurine instead).

Bottom line on low-protein: In general, we advise looking for foods with at least 23% protein DM (21% on the label, also expressed “as fed,” for dry foods), and preferably more. If you feed a diet that contains a significant amount of legumes, or that includes beet pulp or plant proteins, increase this minimum amount of protein to about 30% dry matter (27% as fed for dry foods). If you feel you must feed a diet with less protein than this, we advise supplementing your dog with taurine.

Additional recommendations

Beet pulp is known to interfere with taurine absorption. A 2016 study published in the Journal of Animal Science and Technology found that beet pulp may contribute to a decrease in taurine levels in dogs, both because it reduces protein digestibility (and thus the availability of the sulfur amino acids methionine and cysteine, taurine’s precursors) and because it increases fecal excretion of taurine.

Beet pulp is commonly used in dog foods as a source of fiber, but because of its effect on taurine, it would be safest to avoid this ingredient in diets with any of our “L’s” of concern (Lamb-based, Legume-rich, Low-protein, or Limited-ingredient).

The FDA also named potatoes and sweet potatoes as suspect ingredients, but we have our doubts about their potential contribution to diet-related DCM. Both of these ingredients have been used in pet food for much longer than peas and other legumes, and neither is used as an alternative to or replacement source of animal protein.

Our analysis supports this hypothesis: All of the reported grain-free dry foods with significant amounts of potatoes or sweet potatoes also fell into one or more of the other at-risk categories. If these ingredients were truly a risk factor, we would have expected to see many foods reported that contained potatoes or sweet potatoes but did not contain legumes and were not lamb-based, limited-ingredient, or low in protein. At this point we do not feel that the data support avoiding foods that contain potatoes or sweet potatoes.

One ingredient in this category concerns us, however: potato protein. We don’t like to see incomplete plant proteins used to replace better quality, pricier animal proteins, or to inflate the protein percentage on the label.

Remember the four “L’s”

Again, remember that we don’t know for sure if following our guidelines will help your dogs avoid developing DCM, but we believe they are your best option until more is known.

Four types of diets – those rich in legumes (peas, lentils, beans, chickpeas); limited-ingredient diets (especially those that use kangaroo); lamb-based diets; and diets that are low in protein or that rely too much on plant proteins – may be associated with low taurine bioavailability that could lead to DCM, particularly in certain breeds, large dogs, and those who eat less than expected for their size. We believe that limiting how much you feed of these types of diets, and/or supplementing your dogs with taurine, should help keep them safe.

FDA Updates

• FDA Investigation into Potential Link between Certain Diets and Canine Dilated Cardiomyopathy (June 2019)
• Questions & Answers: FDA Center for Veterinary Medicine’s Investigation into a Possible Connection Between Diet and Canine Heart Disease (currently shows updated June 27, 2019)
  • includes link to spreadsheet of all DCM case reports submitted through April 30, 2019
• FDA Provides Third Status Report on Investigation into Potential Connection Between Certain Diets and Cases of Canine Heart Disease (June 2019)
• FDA Investigating Potential Connection Between Diet and Cases of Canine Heart Disease (July 2018)

References

Veterinary articles on the recent investigation into diet and DCM in dogs

• A broken heart: Risk of heart disease in boutique or grain-free diets and exotic ingredients (Lisa Freeman, June 2018)
  • Freeman’s original article in response to the initial FDA report.
• Stop reading your pet food ingredient list! (Freeman, March 2019)
  • A follow-up article expanding on the first.
• Dilated Cardiomyopathy and Grain-Free Diets: Thoughts on the FDA Update (Justin Shmalberg, DACVN, July 3, 2019)
  • An extensive analysis written by another veterinary nutritionist.
• Rotating diets: antidote to pet-food recall risks? (VIN News Service, July 30, 2019)
  • Discusses differing opinions among veterinarians as to the pros and cons of rotation feeding for dogs. Includes quotes from Dr. Joe Bartges, a nutrition consultant at the Veterinary Information Network, and Dr. Paul Pion, one of the veterinarians who first discovered the link between taurine and DCM in cats, supporting feeding a variety of different foods.

Taurine

• History of diet-related links between taurine deficiency and DCM
  • Relationship Between Circulating and Dietary Taurine Concentrations in Dogs with Dilated Cardiomyopathy
    • Veterinary Therapeutics, Vol. 2, No. 4, Fall 2001
    • Retrospective study found no correlation between blood taurine levels and dietary taurine in dogs with DCM, and no difference in outcome when both taurine-deficient and nondeficient dogs were supplemented with taurine.
  • Taurine status in normal dogs fed a commercial diet associated with taurine deficiency and dilated cardiomyopathy
    • J Anim Physiol Anim Nutr (Berl). 2003 Oct;87(9-10):359-72
    • Study found that taurine excretion was more than three times greater for dogs fed a commercial lamb meal and rice diet compared to those fed a poultry by-product-based diet, though blood levels of taurine remained similar in both groups.
  • Taurine deficiency in Newfoundlands fed commercially available complete and balanced diets
    • Journal of the American Veterinary Medical Association 223(8):1130-6 · October 2003
    • An investigation of the taurine status in a group of related Newfoundlands found that the taurine-deficient dogs had been fed lamb meal and rice diets, and that the taurine deficiency was reversed by a change in diet or methionine supplementation.
  • Taurine deficiency in dogs with dilated cardiomyopathy: 12 Cases (1997-2001)
    • Journal of the American Veterinary Medical Association 223(8):1137-41 · November 2003
    • One of the early published studies linking DCM with taurine deficiency in dogs eating lamb and rice diets.
  • Nutritional dilated cardiomyopathy in a 5 year old mixed breed dog
    • Cornell University College of Veterinary Medicine April 23, 2014
    • Case history of a dog diagnosed with DCM after being fed a homemade vegan diet, with other dogs in the same home eating the same diet similarly affected.
    • Lists additional breeds: American Cocker Spaniels, Golden Retrievers, Newfoundlands, Labrador Retrievers, Dalmatians, English Bulldogs, Portuguese Water Dogs and Irish Wolfhounds
  • Dietary beet pulp decreases taurine status in dogs fed low protein diet
    • J Anim Sci Technol. 2016; 58: 29.
    • Study done to determine whether the known risk of taurine-deficiency-induced DCM in dogs fed lamb and rice diets is linked to the inclusion of either rice bran or beet pulp. The study concluded that rice bran was not a contributing factor, but beet pulp may contribute to a decreased taurine status in dogs.
  • Relationship of taurine to the current FDA investigation
    • Diet-associated dilated cardiomyopathy in dogs: what do we know?
      • JAVMA | DEC 1, 2018 | VOL 253 | NO. 11
      • An overview of diet-associated DCM, including known information about a link between taurine deficiency and lamb and rice, low-protein, and high-fiber diets, as well as beet pulp. Includes dosage guidelines for taurine supplementation
    • Taurine deficiency and dilated cardiomyopathy in golden retrievers fed commercial diets
      • PLoS One. 2018; 13(12): e0209112.
      • Study found that 23 of 24 dogs who developed DCM while eating diets that were grain-free and/or legume-rich improved with diet change and taurine supplementation. No difference was found when L-carnitine was supplemented as well as taurine. Measurement of taurine status in dogs yields inconsistent results.
      • Journal Scan: DCM and boutique dog foods: Can taurine supplementation help?
        • Summary of the study.
      • Echocardiographic phenotype of canine dilated cardiomyopathy differs based on diet type
        • Journal of Veterinary Cardiology Volume 21, February 2019, Pages 1-9
        • Study compared several factors in 48 dogs with DCM. It found that the dogs fed a grain-free diet were not taurine deficient, yet seven dogs reevaluated after diet change (six received taurine supplementation as well) all showed improvement.
      • Frequently Requested Information Regarding Taurine & Dilated Cardiomyopathy in Golden Retrievers
        • STERN CARDIAC GENETICS LABORATORY, JOSHUA A. STERN, DVM, PHD, DACVIM (CARDIOLOGY) March 4, 2019
        • Guidelines for veterinarians regarding taurine testing and treatment. Includes dosage guidelines for taurine supplementation, recommended for all dogs with evidence of DCM even if not taurine deficient.
      • Special topic: The association between pulse ingredients and canine dilated cardiomyopathy: addressing the knowledge gaps before establishing causation
        • Journal of Animal Science, Volume 97, Issue 3, March 2019, Pages 983–997
        • Detailed analysis of amino acid guidelines and history suggests that AAFCO requirements for methionine and cysteine should be increased and that taurine requirements should also be considered. Conclusions mention that “final product formulations should be assessed for nutrient balance and bioavailability, especially when using a limited number of ingredients (emphasis ours).”
      • Food Sources of Taurine
        • The potential protective effects of taurine on coronary heart disease
        • Taurine Content in Foods

Truth About Pet Food

• Grain Free equals Peas, Peas and More Peas (September 2015)
  • A discussion of how the amount of peas and other legumes in pet foods has increased, and why relying heavily on peas and other legumes may not be a good idea, three years before the first FDA report was released. Does not discuss DCM.
• DCM Study Misses Big Picture (December 2018)
  • Discusses limitations of AAFCO food trials, specifically regarding the issue of DCM.
• No grain-free dog food heart disease in Europe…Why? (January 2019)
  • Discusses differences between AAFCO and FEDIAF nutrient standards.
• Is it any wonder Pet Owners are Suspicious? (April 2019)
  • Discusses serious issues with the big pet food manufacturers recommended by some veterinary nutritionists.

WSAVA, Feeding Trials

• WSAVA Global Nutrition Committee: Recommendations on Selecting Pet Foods (2013)
  • WSAVA guidelines being recommended by some veterinary nutritionists.
• When is a Test not a Test? (December 2018), Laurie Coger, DVM
  • A veterinarian discusses the limitations of AAFCO feeding trials.

Pet Food Industry

• Articles written by board-certified companion animal nutritionist Ryan Yamka discussing issues with the ‘BEG’ designation.
  • ‘BEG’ pet food does not equal DCM (Ryan Yamka, July 30, 2019)
  • ‘BEG’ pet food and DCM, part 2: Is veterinary bias at play? (Ryan Yamka, September 10, 2019)
• Articles written by PFI editor-in-chief about how the FDA investigation is affecting pet food companies and retailers.
  • FDA dog food warning hasty, too focused on ingredients (Debbie Phillips-Donaldson, July 23, 2018)
  • Update: FDA pet food ingredient and DCM investigation (Debbie Phillips-Donaldson, September 10, 2018)
  • DCM cases: unknowns prove need for more pet food research (Debbie Phillips-Donaldson, February 22, 2019)
  • DCM’s influence on new pet food trends, product launches (Debbie Phillips-Donaldson, August 27, 2019)
  • Grain-free pet food backlash: The influences and irony (Debbie Phillips-Donaldson, September 9, 2019)
  • Pet food retailers on frontline with consumers’ DCM fears (Debbie Phillips-Donaldson, September 11, 2019)
• Articles written by Tim Wall, staff reporter, about the potential link between diet and DCM in dogs.
  • Do peas and potatoes really cause heart disease in dogs? (Tim Wall, July 19, 2018)
  • 6 studies related to dog food and canine heart disease (Tim Wall, August 3, 2018)
  • New dog foods, toppers address DCM concerns at SuperZoo (Tim Wall, August 23, 2019)
    • Pet nutrition researchers suggested taurine supplementation in dog food as a potential, stopgap measure to prevent DCM while scientists search for hard answers, during a panel discussion at Petfood Forum 2019. One new product was positioned to allow dog owners to do just that for themselves. InClover’s BioVibrant Taurine Plus comes in a shaker container like one used for spices. The dog food topper is marketed as providing “the missing piece for peace of mind.”
  • 3 ways eggs provide complete protein in dog food (Tim Wall, August 31, 2019)
• Articles written by various authors about the initial increased use of peas and other legumes in dog food.
  • Sensitive systems and finicky pets (Jessica Taylor, February 13, 2009)
  • Pulses: new ingredients for petfoods? (Greg Aldrich, February 19, 2010)
  • Peas in petfood (Greg Aldrich, March 26, 2010)
  • FAO recognized primary pulses (July 12, 2010)
    • Shows amount of protein, fat and fiber in peas, chickpeas, lentils, pinto beans
    • in comparison, flaxseed has 7% moisture, 18.3% protein, 42.2% fat, 3.7% ash and 27.3% dietary fiber according to https://nutritiondata.self.com/facts/nut-and-seed-products/3163/2
  • Bringing sustainable ingredients to petfood (Jessica Taylor, August 9, 2010)
  • Pea fiber: a functional petfood ingredient (Greg Aldrich, December 6, 2010)
  • Pea proteins: Alternative protein source for petfoods? (Greg Aldrich, August 2, 2012)

Hill’s Recalls

• FDA Alerts Pet Owners and Veterinarians About Potentially Toxic Levels of Vitamin D in 33 Varieties of Hill’s Canned Dog Food in Expanded Recall (updated May 20, 2019)

This article is a sidebar to our post “Diet, Dogs, and DCM”, which appeared in the November 2019 issue

If this is the first you’re hearing about this issue, please don’t panic and immediately switch your dog’s diet, unless your dog is used to eating different foods. Suddenly changing foods is likely to cause digestive upset in dogs that are unused to it. The longer you’ve been feeding the same food, the more likely your dog is to need time to adjust to something different.

Start by replacing very small amounts of the old food with the new. If your dog is doing well, gradually increase the amount of the new food while decreasing the old. This may take just a few days, or up to a few weeks, depending on how long you’ve been feeding the same thing and how sensitive your dog’s digestive system might be.

Stick with new foods that have a similar level of fat to what you’ve been feeding, at least to start with; it’s more likely that a dog will develop digestive issues if switched from a low-fat diet to one that is higher in fat, particularly if the switch is done too quickly or the dog has been on the low-fat diet for a long time.

If your dog is prone to food allergies, it’s likely he will react quickly with itching and scratching if you feed an ingredient that he’s allergic to. Digestive upset may point toward a food or fat intolerance, or may just be the result of trying to switch too quickly; if your dog vomits or has diarrhea, go back to the old diet until he’s back to normal, then try the switch once more, going even more slowly the second time. If your dog continues to have digestive upset with that food, try something else. Keep a journal of which foods you try and the ingredients in each, and you may be able to pinpoint the ones that cause problems for your dog.

If you have been feeding a limited-ingredient diet because your dog tends to have either allergic (itchy) reactions or digestive upset with other foods, here’s what we would recommend. Start by feeding another food in the same line of foods, so that only the protein source changes. Keep track of which proteins your dog has problems with, and which he does well with. Once you know which proteins your dog can tolerate, try another brand of limited-ingredient diet with a protein your dog is okay with. Continue trying different proteins from the same lines, and different brands of foods using those proteins to get a better idea of which ingredients cause problems for your dog. Once you’ve identified the actual ingredients that your dog has trouble with, you can then try branching out into other foods that are not limited-ingredient diets.

We know that many people feed the same food to their dogs all the time because it’s easier, or because they think it’s better (since that’s what dog food companies and many vets recommend), or because they tried a different food once or twice and their dog didn’t like it or didn’t do well on it. In these cases, we still recommend trying to switch your dog to a different diet, or preferably multiple diets using different brands of foods and different primary ingredients. We still believe that this approach is not only more likely to prevent DCM, but also helps prevent food allergies from developing, and provides protection against any nutritional deficiencies or excesses found in any single diet, as well as issues that lead to recalls.

For those who feed a rotational diet, we advise restricting foods in at-risk categories to less than half the overall diet. That means if you feed just one or two foods, neither should be in any of the at-risk groups we describe. If you feed three or four different foods, one can be among the at-risk categories. If you feed five or six different foods, two can be among the at-risk categories. Foods that fit into more than one of the at-risk categories are likely to be a higher risk than foods that fit into just one; the more categories a food fits into, the higher the potential risk. At least half the foods you feed should have: common meats such as chicken, turkey or beef (not lamb), multiple (not limited) ingredients, little or no legumes, and moderate to high protein.

This article is a sidebar to our post “Diet, Dogs, and DCM”, which appeared in the November 2019 issue

Some people will be upset that we didn’t name all 293 foods that have been reported to the FDA as being possibly connected to DCM. Those people think that if they could just see the list of named foods, they could avoid those and feel safe feeding anything else, but that’s simply not the case. Just because a food was named does not mean it should not be fed, particularly if there were only one or two reports for that food, or if the food has been reformulated or added taurine since the reports were made. We have no way of knowing how valid the reports might be; it could be pure coincidence that a dog developed DCM while eating this food, particularly in breeds known to be genetically prone to DCM, or maybe the dog was recently switched to that food, so it wouldn’t have had time to cause heart problems.  

Conversely, just because a food is not named does not mean it is therefore safe to feed. Only a small percentage of suspected cases ever get reported to the FDA, and the likelihood of reports goes down for foods that have a small market share or are new to the market. The list of reported foods is also a moving target: not only will there continue to be more reports, but companies are likely to change the formulations or the names of their foods over time, so that the food currently on the shelf is no longer the same as the food that was reported, or a reported food has the same formulation but a different name. Looking for names is not going to help; knowing what to look for in ingredient lists is far more important.

With that said, there were a few foods that were reported so frequently that, even though they met AAFCO guidelines, we suspect they all contributed in some way to the development of DCM in some dogs. We are going to provide those names, though most now contain added taurine (and we applaud the manufacturers for doing so). We will also show the major ingredients in each food at the time of the reports, to the best of our ability (it is not always possible to know when an ingredient list changed). Below, you will find the seven products that were mentioned most frequently in the reports, with the factors that may be linked to DCM in bold type.

Note: In its June 2019 Update, the FDA provided a chart that listed the 16 companies with the most products listed among the reports it was investigating to date. No information was provided as to which of the foods made by those companies were the ones that were associated with the reports. In our view, this may have been unfairly damaging to certain companies, and offered consumers no information as to which products may have been free of mentions in the reports. We were more interested in trying to figure out which products had the most mentions in the reports, and what they had in common.

1. (44 reports) Zignature Kangaroo Limited Ingredient Formula (dry):
   • Old formula: Kangaroo, Kangaroo Meal, Peas, Chickpeas, Pea Flour, Sunflower Oil (preserved with Citric Acid), Flaxseed, Red Lentils, Green Lentils, Dehydrated Alfalfa Meal, Pea Protein, Natural Flavors, Salt, . . .
   • Guaranteed Analysis: minimum 26% Protein
   • Product has added taurine and been reformulated since the first FDA report was released.
   • In total, Zignature had 12 foods named in a total of 77 reports (33 in addition to the dry Kangaroo Formula). The most named formulas other than Kangaroo were Turkey Formula (6), Lamb Formula (5) and Trout & Salmon Meal Formula (5), all dry foods. Three reports were for canned foods. All Zignature formulas are high in legumes and limited-ingredient. The guaranteed analyses show minimum protein ranging from 26-32%, with the Kangaroo Formula having the lowest protein percentage. The company states that they began supplementing all of their diets with taurine after the FDA reports were released.
2. (22 reports) Acana Singles Limited Ingredient Lamb & Apple Formula (dry):
   • Old formula: Deboned lamb, lamb meal, whole green peas, red lentils, lamb liver, lamb fat, pinto beans, chickpeas, herring oil, green lentils, whole yellow peas, lentil fiber, Red Delicious apples, natural lamb flavor, lamb tripe, lamb kidney, lamb cartilage, dried kelp, whole pumpkin, whole butternut squash, kale, spinach, mustard greens, collard greens, turnip greens, whole carrots, Bartlett pears, freeze-dried lamb liver, freeze-dried lamb tripe, pumpkin seeds, sunflower seeds, . . .
   • Guaranteed Analysis: minimum 31% Protein
   • Product has added taurine and been reformulated since the first FDA report was released.
   • In total, Acana had 18 foods named in a total of 78 reports (56 in addition to the Lamb & Apple Singles Formula). The most named formulas other than Lamb & Apple were Pork & Squash Singles (11), Duck & Pear Singles (8), Heritage Freshwater Fish (5), and Heritage Free-Run Poultry Formula (4). A total of 43 reports were for the Singles (limited-ingredient) line of foods, followed by 16 reports for the Heritage line and 10 for the Regionals line. All reports were for dry foods (Acana does not make canned foods). All reported Acana formulas are high in legumes; all Singles formulas are limited-ingredient. The guaranteed analyses show minimum protein ranging from 27-35%, with a discontinued Singles Formula (Wild Mackerel) having the lowest protein percentage. The company states that they reformulated their Singles foods, adding more meat and taurine supplementation, in September 2018.
3. (18 reports) Earthborn Holistic Grain Free Meadow Feast with Lamb Meal (dry):
   • Lamb Meal, Peas, Tapioca, Canola Oil (preserved with Mixed Tocopherols), Pea Protein, Pea Fiber, Flaxseed, Natural Flavors, Blueberries, Cranberries, Apples, Carrots, Spinach, Salt . . .
   • Guaranteed Analysis: minimum 26% Protein
   • No changes that we’re aware of since the first FDA report was released but already included added taurine.
   • In total, Earthborn Holistic had 5 foods named in a total of 37 reports (19 in addition to Meadow Feast). A total of 43 reports were for the Singles (limited-ingredient) line of foods, followed by 16 reports for the Heritage line and 10 for the Regionals line. The most named formulas other than Meadow Feast were Coastal Catch (8), and Great Plains Feast (4). All reports were for grain-free dry foods. All reported Earthborn Holistic formulas are high in legumes. The guaranteed analyses show minimum protein ranging from 25-32%, with Meadow Feast having one of the lowest protein percentages. The company states that they have always fortified their grain-free recipes with taurine and other amino acids. Earthborn Holistic is a Midwestern Pet Foods brand.
4. (12 reports) California Natural Kangaroo & Red Lentils Recipe, Grain Free Limited Ingredient Diet (dry):
   • Kangaroo, Red Lentils, Green Lentils, Peas, Sunflower Oil, Flaxseed, Pea Fiber, . . .
   • Guaranteed Analysis: minimum 21% Protein
   • This brand has been discontinued.
5. (12 reports) Kirkland Signature Nature’s Domain Salmon Meal & Sweet Potato Formula (dry):
   • Salmon meal, sweet potatoes, peas, potatoes, canola oil, ocean fish meal, pea protein, potato fibre, natural flavour, flaxseed, salt, . . .
   • Guaranteed Analysis: minimum 24% Protein
   • No changes that we’re aware of since the first FDA report was released; does not contain taurine according to the ingredient list on the Costco website.
   • In total, Kirkland Signature had 7 foods named in a total of 34 reports (22 in addition to Salmon Meal & Sweet Potato Formula). A total of 5 foods and 32 reports were for the Nature’s Domain line. The most named formulas other than Salmon Meal & Sweet Potato were Nature’s Bounty Organic Chicken & Pea (8), and Nature’s Bounty Turkey Meal & Sweet Potato (3). All reports were for dry foods (Kirkland Signature does not make canned foods). All reported Nature’s Domain formulas are high in legumes. The guaranteed analyses show minimum protein ranging from 20-27%. There is no indication that the company is making any changes to their foods. Kirkland Signature is a Costco brand but the Nature’s Domain line is also available elsewhere.
6. (11 reports) Acana Singles Limited Ingredient Pork & Squash Formula (dry):
   • Old formula: Deboned pork, pork meal, whole green peas, red lentils, pork liver, pork fat, pinto beans, chickpeas, herring oil, green lentils, whole yellow peas, whole butternut squash, pork kidney, lentil fiber, natural pork flavor, pork cartilage, dried kelp, freeze-dried pork liver, whole pumpkin, kale, spinach, mustard greens, collard greens, turnip greens, carrots, Red Delicious apples, Bartlett pears,, . . .
   • Guaranteed Analysis: minimum 31% Protein
   • See above for more information on Acana.
7. (11 reports) Taste of the Wild Pacific Stream Canine Recipe (dry):
   • Salmon, ocean fish meal, sweet potatoes, potatoes, peas, canola oil, lentils, salmon meal, smoked salmon, potato fiber, natural flavor, salt, . . .
   • Guaranteed Analysis: minimum 25% Protein
   • Product has added taurine since the first FDA report was released.
   • In total, Taste of the Wild had 11 foods named in a total of 63 reports (52 in addition to Pacific Stream). A total of 5 foods and 32 reports were for the Nature’s Domain line. The most named formulas other than Pacific Stream were High Prairie (10), Sierra Mountain (6), Pine Forest (6), Prey Angus Beef Limited Ingredient Formula (5) and Prey Trout Limited Ingredient Formula (5), with an additional 12 reports for unspecified grain-free formulas and 3 reports for unspecified Prey limited-ingredient formulas. All reports were for dry foods. All reported Taste of the Wild formulas are high in legumes; all Prey formulas are limited-ingredient. The guaranteed analyses show minimum protein ranging from 25-32%. The company states that they began adding taurine to recipes without grains after the initial FDA report was released.