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Can dogs be vegetarian? (and why cats can’t)

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Prasanna Muralidharan
Founder, Growlrr · 25 August 2026
Cubs of the cat and dog family ancestors together — tiger, lion, panther and cheetah (obligate carnivores) with wolf, fox and dhole pups (facultative carnivores)
Growlrr feeds each species as what it actually is. A diverse fresh-meat bowl — chicken, mutton/goat, tilapia and egg — corrected to the NRC 2006 nutrient floors — the minimum healthy amounts set by the NRC 2006 standard, the international nutrient reference vets and nutritionists use — with one weight-dosed 5 g BowlBalancer™ sachet (CatCore™ for cats, DogCore™ for dogs), validated across 1 Million+ vectors · Wilson C/R 95/99 (tested across a million-plus simulated feeding days — 95% confidence of delivering at least 90% of the standard on at least 99% of days). The biology behind it: cats are obligate carnivores that must get taurine (an amino acid cats must get from food), arachidonic acid and preformed vitamin A from animal tissue and barely handle carbohydrate; dogs are facultative — omnivorous by adaptation but carnivore-leaning — and neither species evolved for the high-starch base of most kibble.

The obligate carnivore: cats

Cats are obligate carnivores. Their biology expects animal protein, animal fat, taurine, arachidonic acid and preformed vitamin A — nutrients present in physiologically useful amounts only in animal tissue (cats cannot make enough taurine themselves, and cannot convert beta-carotene to vitamin A the way dogs and humans do). They also have very limited capacity to digest carbohydrate. A cat's diet should be overwhelmingly animal-based by calories — yet the first ingredients on many "premium" cat kibbles are grains or legumes.

The facultative predator: dogs

Dogs co-evolved with humans and are omnivorous by adaptation: unlike cats, they carry the enzyme machinery to use some starch. But adaptation is not the same as optimum. Dogs remain carnivore-leaning, and they thrive on a diet anchored in animal protein. High-starch kibble exists because extrusion, shelf life and national logistics demand a starch binder — not because carnivores evolved to eat it.

Why the base matters

Feeding a carnivore a bowl that is half starch pushes its metabolism toward chronic stress on glucose handling and body condition, and low-moisture kibble adds ongoing water strain. Keeping lean body condition across a dog's life is itself associated with healthier aging (Kealy 2002). None of this is a disease claim — it is simply that a species-appropriate base gives the body less to compensate for.

Thriving vs. surviving. A dog "can" survive on starch and lentils; a cat "can" limp along on a fish-flavoured biscuit. Survival is not the goal. Aligning the daily bowl with what each species actually is — animal-first, diverse, complete — is.

The Growlrr approach

We anchor the diet in a diverse fresh-meat bowl — chicken, mutton/goat, tilapia and egg (with curd and a little veg for dogs) — and close the unavoidable micronutrient gaps with a single 5 g BowlBalancer™ sachet dosed to weight, balanced to the NRC 2006 floors and validated across 1 Million+ vectors · Wilson C/R 95/99. For the taurine question specifically — why homemade cat food almost always needs it added — see our companion piece on homemade cat food and taurine.

References

  • National Research Council (NRC). Nutrient Requirements of Dogs and Cats. Washington, DC: National Academies Press; 2006.
  • Association of American Feed Control Officials (AAFCO). Dog and Cat Food Nutrient Profiles (current edition).
  • FEDIAF. Nutritional Guidelines for Complete and Complementary Pet Food for Cats and Dogs (current edition).
  • Kealy RD, et al. Effects of diet restriction on life span and age-related changes in dogs. J Am Vet Med Assoc. 2002;220(9):1315–1320.

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