Dogs cn survive on a vegetarian diet, if it's suplemented with vitamins. Cats can't.
I am a vegetarian myself, but my dog isn't. In fact, he's quite often given raw meat.
>Dogs cn survive on a vegetarian diet, if it's suplemented with vitamins.<
They might survive, but they sure don't thrive. Not only that, if you stick a piece of liver and a piece of bread down in front of a dog, you better not be between him and the liver!
Cats can easily catch the meat they need if they're out in the country. Lizards and flies are meat as well as mice and rats.
My dog is surviving on a purely vegetarian diet (well, sometimes I cheat). Going on 2 years and she's only a bit older than that. I have to say she doesn't look or act any differently (except for helping the allergy problem), but the vet has always been concerned about getting some "meat" back in her diet. We just cannot find a way to do it.