Hi , yes there are many vegan dogs and cats now. The longest living dog in the guinness book of records was vegan.Called Bramble. Book even written on this border collie. There are thousands of thriving on vegan diets cats and dogs out there. It is about nutrition not substance. 1 in 8 of a litter of wild wolves never made it to adulthood…poisoned by food issues all sorts our pets are not wild wolves or we would not need to feed them. Much research done with links here. actually having myself done great research as a vegan…having vegan dogs as do thousands that thrive on vegan diets… I collected on the subject. http://vegan-information.com/Vegan_Dogs_and_Cats.html where there are links to vet articles and suppliers of vegan foods. I have 2 vegan dogs.
