Features April 2004 Issue

Hawthorn Herb Improves Cardiac Function in Dogs

Older dogs in need of a general tonic will benefit most from this herb.

[Updated August 22, 2018]


1. Consider hawthorn as a supplement for a dog with heart problems – especially high or low blood pressure, and arrhythmia.

2. Use hawthorn as a tonic for older dogs, in conjunction with an improved diet.

As a traveling, lecturing herbalist, I often hear the question of whether herbs might be helpful in treating old or debilitated dogs with chronic disease.

My answer: Yes – especially when used to supplement a good, natural diet and to strengthen or “tonify” the body’s natural healing functions. When used in this capacity, we refer to herbs as herbal tonics.

Cardiac Function in Older Dogs

Older dogs, especially those with cardiac or renal problems, can benefit from a daily dose of safe, effective hawthorn, in the form of hawthorn tea, tincture, or fresh berries.

Unlike most conventional drugs, tonic herbs do not suppress or replace natural functions in the body. Instead, they serve to improve the body’s efforts to stay healthy. Tonic herbs are neither drug-like remedies nor foods, but stand somewhere in between, providing supplemental measures of support that help bridge the gaps between what a body needs from diet and what it needs in terms of specific, added support.

Most tonic herbs do their work by providing special nutrients, enzymes, and other chemicals that the body needs to bring deficient or overtaxed organs and systems into higher levels of efficiency.

Hawthorn (Crataegus species), a tonic herb that has been used for centuries to improve cardiac function and output, is a classic example. Hawthorn does not initiate any immediate changes in heart function, but does so very gently over time, without adding stress or interfering with other body functions. Hawthorn helps support the heart and cardiovascular system in ways that no food or drug can.

Hawthorn is a Preventative Heart Tonic

Hundreds of scientific studies have validated hawthorn’s usefulness as a heart tonic.

It is well known that hawthorn dilates both coronary vessels and vessels of the brain, helping to increase circulation and the transport of nutrients and oxygen throughout the body.

It accomplishes this in a very effective and unique fashion: while it acts to dilate major vessels, it also increases blood flow from the heart to compensate for any reduction of arterial blood volume. In other words, it helps the body push more blood around by increasing cardiac output and decreasing blood flow resistance in the arteries, i.e., more blood flow at less pressure. This has been shown in studies performed with dogs, especially when used in small doses over an extended period.

Hawthorn also serves as a blood pressure regulator. Although the mechanisms of this activity baffle herbalists and scientists alike, the herb tends to gently elevate low blood pressure, and decrease high blood pressure. This is really quite amazing, especially when we consider the fact that hawthorn does this while increasing cardiac output. By helping with dilation of coronary arteries and strengthening heartbeat, hawthorn improves blood circulation without adversely effecting blood pressure.

Another well-documented benefit of hawthorn is its ability to steady and strengthen a weak or erratic heartbeat – such as that of elderly or energetically challenged dogs. In human applications hawthorn has been used as an alternative to antiarrhythmia drugs like digitalis, and to improve the effects of that and other cardiac drugs.

Hawthorn is also a great antioxidant. It scavenges free radicals that rob the blood of oxygen and may lead to various forms of vascular disease. Herbalists also use the herb to lower blood cholesterol.

All of these activities are largely attributed to a vast assortment of flavonoid constituents held within the berries, leaves, flowers, and twigs of hawthorn. Although flavonoids are also found in many other kinds of fruits (especially raspberries, blueberries, and other red or blue fruits), hawthorn is an especially rich source.

Studies have shown that flavonoids are essential in maintaining disease resistance and the integrity of smooth muscle tissues throughout the body. Some studies even suggest that hawthorn may help prevent myocardial damage in situations where the heart muscle is subjected to physiological stress. This means that animals such as race horses or working dogs who are constantly under cardiovascular stress will likely find preventive benefits from daily supplements of hawthorn.

And to top everything off, hawthorn is very, very safe. In fact, in the hundreds of animal studies that have been conducted with this herb over the past 100 years, hawthorn has shown extremely low toxicity in every animal tested. I place the risk of hawthorn berry toxicity on about the same level as that presented by rose hips, raspberries, or blueberries. In other words, I consider them all as medicinal foods.

Daily Hawthorne Use Shows Cardiac Improvements

It stands to reason that this cardiovascular tonic is useful in the daily care of any older dog, but especially those who suffer from chronic heart problems such as arrhythmia, congestive heart failure, postsurgical dysfunction, or other cardiac anomalies that have weakened the heart’s ability to pump blood.

I consider hawthorn to be strongly indicated in virtually any case where damage to the heart muscle has resulted from heartworm infestation, bacterial or viral infections, or protracted chemotherapy.

I also find hawthorn useful in cases of renal failure, especially in early stages of the disease. When combined with ginkgo biloba (for small capillary circulation) and herbs that improve urinary function, hawthorn may be useful for getting more blood and oxygen into renal arteries and smaller vessels of the kidneys. This, in theory, is thought to slow degeneration of whatever healthy tissue remains in the diseased organs.

What is Hawthorn, Anyway?

hawthorn plant

Hawthorn is small deciduous tree or large shrub (up to 16 feet tall) that is easily recognized and quickly remembered by its nasty one- to three-inch curved thorns, which are strategically spaced along the branches – often at eye-level! The alternate leaves are narrowly fan-shaped or ovate and are presented on short petioles. The margins of the one- to two-inch-long leaves are toothed, with tips all pointing distinctly forward.

Blooms appear on the hawthorn plants from around April through June. The white, quarter-inch flowers are presented in flat, terminate clusters; each blossom with five petals and numerous stamens. When in full bloom, the blossoms often have an unpleasant “dead” odor. In late summer the flowers are replaced with clusters of red to black berries, each containing two to five seeds.

The Crataegus genus is large and varied, with hundreds of species (all of which readily hybridize) in North America. Most species are found in riparian thickets, where they serve as important forage and nesting habitats for birds and other wildlife. While Crataegus oxyacantha and C. monogyna are the primary hawthorns of commerce, C. douglasii is one of the most common and widespread wild species of North America. While very little study has been done to ascertain which species are most useful, most herbalists will agree that all of them hold therapeutic value.

How to Feed Hawthorn to Your Dog

When combined with a good natural diet and other tonic herbs, hawthorn will act exactly as an herbal heart tonic should – to fill the special cardiac needs in the golden years of an animal’s life.

Other tonic herbs can be used in combination with hawthorn to round out the supplemental needs of older animals. These might include ginkgo or yarrow (for strengthening capillary walls and improving blood supply to the kidneys and extremities); garlic (for added antioxidant and immune system support); alfalfa and red clover (to nourish the blood, increase appetite, and raise energy levels); dandelion leaf (to assist in the removal of excess water); and oat tops (as a nervous system tonic).

In the natural pet product industry, the berries of hawthorn are the most commonly used part of this plant. This is probably because they make such palatable medicine. However, the flowering branch ends (leaves, flower buds, twigs, thorns and all) are fine medicine too, and can be clipped into small pieces and brewed into a decoction (a simmered tea). However, unlike the berries, the “twig tea” tastes awful!

If you are lucky enough to have a hawthorn tree near your home and a dog that likes red fruit, you can pick the ripe berries and feed them as tonic treats.

Or, when the berries become fully ripe, they can be picked, dried on a clean sheet of paper, and ground with a mortar or pestle (be forewarned that they burn out small coffee grinders!) into a coarse powder. The powder can then be added to your companion’s diet at a rate of one teaspoon per pound of food fed each day.

If your pup won’t eat the berries either way, try making a tea (with about a teaspoon of dried berries and a cup of hot water) and pouring it over his food. If that doesn’t work, you can use gel caps wrapped with expensive, imported Brie cheese (just kidding!). Better yet, you can use a liquid hawthorn tincture (one-half tsp. for small dogs; one-half to one tsp. for larger dogs). Alcohol-free, glycerin-based tinctures are quite sweet and easiest to feed.

Greg Tilford is a well-known expert in the field of veterinary herblism. An international lecturer and teacher of veterinarians and pet owners alike, Greg has written four books on herbs, including All You Ever Wanted to Know About Herbs for Pets (Bowie Press, 1999), which he coauthored with his wife, Mary.

Comments (7)

Just 1/2 tsp per day for a 25lb dog. I'm using Dr Christopher's Hawthorne berry heart syrup

Posted by: Dinky | March 12, 2018 1:06 AM    Report this comment

My dog is on the borderline of the type of heart disease whereby the heart enlarges. It is inevitable. I started giving him fish oil supplements with Omegas and he immediately perked up. He wasn't depressed, but it perked him up. I then added Enzyme Q-10 and Hawthorn and it is definitely having a noticeable positive effect. I have elected against traditional treatment due to side effects. The Chinese herbals didn't impress me, but I will look into it further.

Posted by: usera1553 | December 25, 2016 11:08 AM    Report this comment

Does anyone know if hawthorn is safe with vetmedin?

Posted by: spike96 | February 4, 2015 3:27 PM    Report this comment

Can anyone tell me how many mg of hawthorn you would give a 65 pound dog

Posted by: blessed4431 | September 6, 2014 6:10 PM    Report this comment

I would like information about adding this product to a dogs cardiac regime. He is currently on vetmedin, lasix, sotatol, and enalapril. I am feeding low sodium or natural diuretic foods as snacks - carrots, raspberries, apples, summer squash. I don't want to do all one or other. Rather I think a balance between herbal and prescription medications are probably best. I just don't want to mix in an herb that will interact negatively with each other. My Booker boy is our oldest baby and want to do the very best we can by him. Our vet admits she isn't knowledgeable about a lot of the herbal supplements for dogs.

Posted by: kjaxin | July 8, 2014 4:27 PM    Report this comment

Hi. I wanted to ask saraberry, the person who commented and asked a question prior to me, if she received an answer to her question because I'd really like to know the answer as well. Please pass my question to her if you would. Greg Tilford may have answered her and I just don't see it... Thanks!

Posted by: pmwoodward | April 28, 2014 1:20 PM    Report this comment

My concerns with this would be interaction with prescribed medications where it could cause less efficacy, contraindications or other issues. Do you know that it won't cause complications for medications such as benazapril or pimobendan?

Posted by: saraberry | December 5, 2012 12:39 PM    Report this comment

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