A dog that runs agility, hunts, or works in the field burns through calories in a way the average pet never does, and feeding them well takes more than a bigger scoop. Companion animal nutritionist Dr. Mary Cope, PhD, breaks down what changes and why.
Whole Dog Journal executive editor Kate O’Connor talked it through with Dr. Cope, from calories and fat to hydration and heat safety.
What counts as an active dog
Nutritionally, Dr. Cope defines an active dog as one that consistently burns more energy than an average pet, usually a dog doing sports like agility, hunting, field work, herding, or dock diving more than a few times a week. Normal daily walks don’t put a dog in this category. The trigger is often simple: the dog starts expending more than it takes in.
How the needs change
Calorie needs rise first, which usually shows up as a dog getting a little ribby. Because fat packs more than double the calories of protein or carbohydrate, Dr. Cope says fat is the efficient lever to pull first. Protein rises modestly to support muscle maintenance and recovery, and she likes to see ingredients that support joints and muscle function too.
More food, or a different diet?
For a moderately active dog, feeding a bit more of a complete and balanced diet may be all it takes. Very active and working dogs often do better on a performance formula built for higher energy density, so you feed a smaller volume while keeping the nutrient-to-calorie balance right. That also solves a common problem: some hard-working dogs simply get full before they can eat enough of a regular food.
What to look for in a food
Start with complete and balanced from a reputable manufacturer, appropriate for the dog’s life stage. For truly active dogs, Dr. Cope looks for higher calorie density with adequate protein (around 30%) and a moderate-to-high fat level (roughly 20-25%). Then watch how the dog actually does on it, energy, body condition, muscle tone, stool quality, and recovery, and transition gradually, ideally starting with a smaller bag in case it doesn’t suit your dog.
Supplements and hydration
Most active dogs get what they need from a complete and balanced diet, though some in intense activities benefit from targeted omega-3s for joint health. Hydration matters for every dog, Dr. Cope stresses: water is the most important nutrient, and dogs cool themselves by panting, so water loss climbs during exercise. She also flags a real safety point, in extreme heat and humidity, evaporative cooling stops working, so be cautious even with casual walks. Keep fresh water available throughout, and be careful about letting bloat-prone dogs chug it.
The one thing to watch
If you track nothing else, track body condition. An active dog should be lean and muscular, and Dr. Cope says body and muscle condition tell you whether the calories are right. Ribs too prominent, slow recovery, or dropping performance point to too few calories; gaining fat despite the activity means too many. Regular weigh-ins are the most valuable tool you have.
The takeaway
Feeding an active dog is really about matching fuel to the work and watching the dog in front of you. Watch the full interview above, and fine-tune with your own veterinarian.
