Reply #52: Dogs can definitely eat a vegetarian diet, being omnivores

[LeftyMom]

they thrive on a plant-based diet just as humans do.

There are cat foods that are vegetarian as well, since all the micronutrients that they need can be derived from plants or synthetic sources, but while many cats do well on them some have urinary tract issues on those foods due to PH differences (this largely a problem with a specific US-based vegan cat food, I hear much fewer problems from people in other countries feeding other vegan cat foods.)

Probably more than you wanted or cared to know, but since you asked that's the story on vegans and feeding our animal friends.