How does judging a cat food differ from judging a dog food?
The checklist is the same, but the needs differ. The cat is an obligate carnivore: it requires a high supply of animal protein and nutrients such as taurine, preformed vitamin A and arachidonic acid, which it cannot make in sufficient amounts (NRC, Nutrient Requirements). A dog food does not cover those needs.
General documentary information. For an individual animal, a veterinarian's advice takes precedence over any online content.
The specifics of the obligate carnivore
The cat depends on meat in a way the dog, a facultative omnivore, does not. It requires dietary taurine, preformed vitamin A and arachidonic acid (NRC, Nutrient Requirements; FEDIAF, 2019). The history that still shapes cat food: a taurine deficiency can cause dilated cardiomyopathy and retinal degeneration in cats, sometimes irreversibly, and the discovery of that link in the 1980s rewrote feline formulation across the industry.
Verifying species suitability
The adequacy statement always names the target species: a food must be formulated for cats, never borrowed from a dog food over the long term (AAFCO, 2024). Beyond that check, the quality criteria stay identical: the maker's expertise, feeding trials, quality control (WSAVA, 2021). The cat's high protein need and limited tolerance for starch also steer the choice toward a recipe built for the species rather than adapted from a dog's.
| Key nutrient | Cat | Dog |
|---|---|---|
| Taurine | Dietary supply required | Partial synthesis |
| Preformed vitamin A | Required | Conversion possible |
| Starch tolerance | Limited | Good |
Petipedia details the needs specific to the obligate carnivore to prevent unsuitable choices, pointing to the vet for medical cases.
Sources
NRC, Nutrient Requirements of Dogs and Cats; FEDIAF, Nutritional Guidelines (2019); AAFCO, Understanding Pet Food (2024); WSAVA, Global Nutrition Guidelines (2021).