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I used to hear that dogs can be given vegetarian dog food, but that cats need meat.

I'm not sure therefore how to interpret the following PETA claim about cats.

Vegetarian Cats and Dogs

If you have been feeding your companion animals commercial pet foods, you may be jeopardizing their health. [...]

Cats are often more finicky than dogs, and their nutritional requirements are more complicated. [...]

James Peden found vegetarian sources of both taurine and vitamin A, plus arachidonic acid, another essential feline nutrient. He then developed veterinarian-approved supplements Vegecat™ and Vegekit™ to add to his recipes. These recipes are probably the healthiest way to feed cats a vegan diet at this time.

What evidence is there for the healthiness of vegetarian cat food? Is it "more healthy" (for the cat), or "as healthy", or "less healthy" than a control (e.g. than some other commercial cat food[s]).

Also, according to this little page, vegetarian cat food seems complicated.

  • The cited Vegecat™ and Vegekit™ are "added to his recipes" rather than being pre-bought cat food
  • Later it suggests you add "digestive enzymes" to "cooked or processed food"
  • Later it says,

    If you decide to prepare your own vegetarian dog or cat food, we recommend that you read Vegetarian Cats & Dogs to ensure that you understand the nutritional needs of dogs and cats. Do not rely on this factsheet for complete information. The book has several recipes and helpful hints. If your library or bookstore doesn’t have it, you can order it from Harbingers of a New Age.

So can you actually even buy, does anyone make and sell commercially, a vegetarian cat-food? Or is this a realm of home-cooked experimentation?

I'm willing to consider answers/evidence which include almost any (non-strict) definition of "vegetarian": even including for example milk or shell-fish; but not meat and meat by-products.

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    As Geobits notes, vegetarian cat food is demonstrably available. As for whether it's as good as normal cat food, that question may be better suited for Pets. – Ilmari Karonen Oct 7 '14 at 19:44
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    My mother told me a story about a woman who was vegan, and tried to only feed her dog home-cooked vegan meals. Long story short: the dog died. – DumpsterDoofus Oct 8 '14 at 17:55
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    I wouldn't rely on PETA as a reliable source of information, they're hardly what you would call objective or disinterested. – GordonM Oct 9 '14 at 12:26
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    @ryan We're designed to die, too. Domestic cats live longer than feral cats. I don't find "argument by design" convincing. – ChrisW Oct 9 '14 at 13:42
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    @DumpsterDoofus My mother told me a story of a dog that choked on a chicken bone. – ChrisW Oct 9 '14 at 13:43
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Here's a link to an article about feline diet evolving idiosyncratic needs:

Idiosyncratic nutrient requirements of cats appear to be diet-induced evolutionary adaptations*

The nutrient requirements of domestic cats support the thesis that their idiosyncratic requirements arose from evolutionary pressures arising from a rigorous diet of animal tissue.

Cats can't eat the wrong food without detriment to health. While science can certainly create an artificial food for any living thing with enough time and research, most people don't research a cat food well enough to understand the pros and cons fully.


Food manufacturers are held to certain standards. While I'm not sure about the recent developments, historically they bear two main concerns as listed in this link:

The Association of American Feed Control Officials Dog and Cat Food Nutrient Profiles: substantiation of nutritional adequacy of complete and balanced pet foods in the United States.

The first means is by formulating the food so that nutrient levels fall within the ranges as established in the AAFCO Dog and Cat Food Nutrient Profiles.

The second means of substantiation is through the conduct of feeding trials following AAFCO protocols.

Beware that secondary dietary concerns are not enforced (for example there are no dietary restrictions on nutrient density that I know of, leaving them eating far too many calories to satisfy their basic needs).

Commercial pet foods have the main benefit of providing essential nutrients, but they do so (usually if not always) in the cheapest way possible.

  • My edit will hopefully contribute a bit. – Don Kindred Oct 7 '14 at 16:52
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    A full-text PDF of the "nutritional adequacy" article you referenced can be found here. – ChrisW Oct 7 '14 at 17:41
  • What do you mean by "secondary nutrient concerns"? The words "secondary" and "primary" aren't in the linked article. I see that the AAFCO nutrient profiles for cats do include e.g. "arachidonic acid" and "taurine" which were mentioned in the PETA article: does that mean that the AAFCO nutrient profiles are sufficiently complete? That any commercial pet food (vegetarian or otherwise) which claims AAFCO compliance is probably 'healthy enough' to not worry about? – ChrisW Oct 7 '14 at 17:52
  • I misspoke. I'll edit the post. What I meant to say was secondary dietary concerns. For instance, there are no dietary restrictions on nutrient density that I know of, leaving them eating far too many calories to satisfy their basic needs. – Don Kindred Oct 7 '14 at 18:51
  • Happy to oblige. – Don Kindred Oct 7 '14 at 20:03

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