Cat food is not dog food. Here’s what the label has to prove differently.

The biology, briefly

“Obligate carnivore” is not a marketing flourish. Cats have lost the metabolic machinery to produce, in sufficient quantity, four nutrients a dog can scrape together from a more omnivorous diet: taurine, arginine, arachidonic acid, and preformed vitamin A. They get those from animal tissue. They also run a higher baseline protein requirement and have essentially no dietary need for carbohydrate. None of that is true of dogs in the same way.

That biology is why AAFCO publishes two separate nutrient profiles - Dog and Cat - and why a food formulated to one is not interchangeable with the other. The clearest single example: the Cat profile sets a taurine minimum. The Dog profile does not.

1. The protein bands move up

The Nutrition Fit sub-score credits dry-matter protein in the band the rubric expects for the species. For cats that band sits higher, because the carnivore baseline is higher. Across the 48cat foods we’ve scored, the average guaranteed-analysis protein is 29% as fed; across our 130 dog foods it’s 26%. A protein figure that would read as high on a dog food is ordinary on a cat food. The rubric grades it on the feline curve, not the canine one.

The same caveat applies as on the dog side: a high number on the panel is not automatically high quality, because plant fractions can inflate it. The rubric also weighs whether the protein is named animal protein. See the high-protein cat list for how that ranking falls out.

2. Taurine is a hard requirement, not a bonus

On a dog food, a declared taurine line is a nice-to-have. On a cat food, it is the difference between a pass and a hard fail. The cat rubric floors Nutrition Fit at 4.0 for any adult or all-life-stages cat food whose label does not declare taurine, because taurine deficiency causes irreversible feline conditions and the Cat profile requires a minimum the label is supposed to substantiate.

Of the 48 cat foods in our catalog, 47 declare taurine on the label and 1 does not. We wrote a whole piece on the one that didn’t - a freeze-dried recipe with chicken hearts as ingredient #3, almost certainly taurine-rich, hard-failed anyway because the label stayed silent. The reasoning is in that editorial.

3. The allergen weighting flips

When pet parents say “sensitive,” the dog and cat literature point at different culprits. In dogs, the most-reported adverse-reaction triggers are chicken-led. In cats, the feline literature points more at beef, fish, and dairy. So the Sensitivity Risk sub-score does not use one shared trigger list - it reads the feline profile for cats. A fish-forward recipe that would look unremarkable on the dog rubric can score lower on the cat rubric for exactly this reason.

One thing that does notmove: we still do not credit “grain-free” as a sensitivity feature for cats any more than for dogs. Grains are not the common feline trigger; proteins are.

4. Water belongs in the conversation

Cats evolved as desert hunters with a weak thirst drive, taking most of their water from prey. That is the honest case for high-moisture food, and it’s why 12of our cat scorecards are canned. We benchmark a wet food’s value against the wet-cat category median so it isn’t punished for costing more per calorie than kibble - see the best wet cat food list. We do not score hydration as a health outcome; we surface the format and rank what is in the can.

What to read off the back of a cat food bag

The four-panel habit from the dog-food label guide still applies, with feline edits:

• AAFCO statement. Confirm it cites the AAFCO Cat Food Nutrient Profiles (or a feeding trial for cats), and the life stage you need.
• Guaranteed analysis. Look for a declared taurine minimum. Its presence is the single fastest trust signal on a cat food.
• First few ingredients. A named animal protein up front is the species-appropriate starting point for an obligate carnivore.
• Calorie content. Small animals, modest daily targets - pair it with the cat feeding calculator.

What we still don’t score

Urinary health, kidney support, hairball control, and weight management are the questions cat owners ask most, and the rubric stays out of all of them. They are clinical calls that depend on the cat in front of your vet, not deterministic facts we can read off a label. We score the food’s transparency and composition; we leave the diagnosis to the people qualified to make it.

- The PetScored desk. The full cat methodology is at /methodology/cat-food; browse every scored cat food at /cat-food/browse.