Too bad that some owners completely forget that a pet's diet is about the pet's needs and instead force them into whatever nutritional ideology they happen to buy into. Sometimes, this manifests itself through spending extra cash to buy holistic pet food for the pet that will surely know and care about the difference. Other times, an owner might put their mutt on an Atkins diet, which is actually kind of impressive, because unless your pet is sick or otherwise handicapped, the only possible reason for him to become fat in the first place is you.
But some people aren't happy just going fad diet or obnoxious organic food on their pets. Some people are so self-centered that they actually want their pet (who is physically incapable of giving a shit) to share their beliefs and ideologies. And that, friends, is why we have vegan pet diets.
"Fucking lettuce again? For this impudence, I shall not bring you
my regular gift of a half-eaten mole tonight."
I'm not going to explain why subjecting poor animals to fucking veganism is a horrible idea. I don't need to, because here's veterinarian Dr. Karen Becker doing that exact thing with way more authority. Unless your pet is a bunny or something (in which case, damn, dude, it's already a vegan) its engine is basically built to run on animal protein. This is -- or at least should be -- common sense, or at the very least one of the first things anyone getting a pet should read up on. Yet there's a certain segment of the population that gives zero shits about facts and force-feeds their kitten rice milk and potatoes.