well some dogs need a veg. diet as they don't do well on meat diets. dalmations are a good example. very few of them can eat meat. they get 'hot spots' on them which itch and can become quite raw.
i was a vegan for many years, i have very strong feelings about the animals we consume... for me, it's all about how the animals were treated when they were alive and how they are killed. i have no problem eating an animal which was treated with respect... fed good food, had space to move about... fresh air etc.
just as i feel humans deserve the same respect...
*steps off soap box*