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

Why your cat needs its own food

“Obligate carnivore” is not a marketing flourish. Your cat’s body has lost the ability to make enough of four nutrients that a dog can cobble together from a more mixed diet: taurine, arginine, arachidonic acid, and preformed vitamin A. Your cat has to eat them, in animal tissue. On top of that it needs more protein day to day and basically no carbohydrate at all. None of that is true of a dog in the same way.

That is the whole reason the regulator, AAFCO, writes two separate nutrient standards, one for dogs and one for cats, and why a food built for one does not simply carry over to the other. The cleanest example: the cat standard sets a taurine minimum. The dog standard does not.

1. Expect a higher protein number

The Nutrition Fit sub-score rewards protein, but the bar it holds the food to is set by the species. For a cat that bar sits higher, because a carnivore simply needs more. The numbers bear it out. Across the 48cat foods we’ve scored, the average protein on the label is 29% as fed; across our 130 dog foods it is 26%. So a protein figure that would look impressive on a dog food is just ordinary on a cat food. We grade it against what cats need, not what dogs need.

One thing carries over from the dog side, though: a big number on the label does not automatically mean good protein, because plant ingredients can pad it. So we also weigh whether that protein is named meat. See the high-protein cat list for how that shakes out.

2. Check for taurine. This is the one that matters most.

If you read only one line on a cat food label, read this one. On a dog food, a listed taurine level is just a nice extra. On a cat food it decides whether the food passes at all. We cap Nutrition Fit at 4.0 for any adult or all-life-stages cat food whose label does not list taurine, because cats cannot make enough on their own, a shortage causes feline conditions that do not reverse, and the label is the only place the food can show you the number is there.

Of the 48 cat foods in our catalog, 47 list taurine on the label and 1 does not. We wrote a whole piece on the one that didn’t. It was a freeze-dried recipe with chicken hearts as ingredient #3, so it was almost certainly rich in taurine. It failed anyway, because the label never said so. The full reasoning is in that editorial.

3. The usual triggers are different foods

If your cat has a sensitive stomach, the foods to watch are not the ones you would watch for a dog. In dogs, the most-reported reactions tend to come from chicken. In cats, the research points more at beef, fish, and dairy. So the Sensitivity Risk sub-score does not lean on one shared list of triggers. It uses the feline one for cats. That means a fish-first recipe that looks unremarkable on a dog food can score a bit lower on a cat food, for exactly this reason.

One thing does notchange: we still give no credit for “grain-free” on a cat food, the same as on a dog food. Grains are not the common feline trigger. Proteins are.

4. Water is part of the picture

Cats descend from desert hunters and have a weak thirst drive, so they evolved to get most of their water from their prey rather than a bowl. That is the honest case for wet, high-moisture food, and it is why 12of our cat scorecards are canned. When we judge a wet food’s value, we compare it against other wet cat foods, so it is not dinged simply for costing more per calorie than kibble. See the best wet cat food list. We do not score hydration as a health outcome. We show you the format and rank what is actually in the can.

What to check on a cat food bag

The same four-panel habit from the dog-food label guide still works, with a few feline tweaks:

• The AAFCO statement. Make sure it names the AAFCO Cat Food Nutrient Profiles (or a feeding trial for cats), and the life stage your cat is in.
• The guaranteed analysis. Look for a listed taurine minimum. Nothing else tells you faster that a cat food is being straight with you.
• The first few ingredients. A named meat up front is the right starting point for a carnivore.
• The calorie content. Cats are small and their daily targets are modest, so pair this with the cat feeding calculator.

What we still won’t score

Urinary health, kidney support, hairball control, weight management: these are the questions you probably care about most, and we stay out of all of them. They are clinical calls that depend on your actual cat, the one your vet can examine, not something we can read off a bag. So we score what the food is and how honest the label is, and 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.