It's also sad for vegans who try to make their animals vegan too--especially cats, who are obligate carnivores.
I overheard a conversation in my health food store about a vegan woman who took her cat to the vet because it was having trouble walking--her vet said it was severe vitamin A deficiency, and to start feeding the cat liver.
She came to the health food store looking for an alternative to the liver, and the clerk said there wasn't one, but they had organic liver. She bought it, and left.
I would've arrested her for animal cruelty! Of course, I would also arrest people who feed their cats grain- and produce-filled cat foods, because cats can't digest beta carotene or grains. But then, we'd quickly run out of jail cells!
They eat MEAT-live with it. Cook for them if you have to--it's better than any crap at the grocery store! Better yet, cook enough meat to feed YOU and IT--that's the cheapest way.
If you're going to cook for it, at least get a personalized diet from a vet to use as a recipe--there's some individualized health care for you. Believe me, feeding your cat CORRECTLY can save tons on vet bills each year, starting with dental visits.
Just as OUR eating correctly can save money at the doctor, THEIR eating correctly saves at the vet.