"And if you took a baby and put a bunny in front of him, and if you had a cat and a bunny, the cat at any age would want to attack and kill the bunny and the child would say, “Oh, look at the bunny!”

"And if you took a baby and put a bunny in front of him, and if you had a cat and a bunny, the cat at any age would want to attack and kill the bunny and the child would say, “Oh, look at the bunny!” So the idea that we have some innate aggression towards animals…we don’t.

About the teeth: if you open the mouth of a cat, a carnivore, you see that they have long canines, way beyond the other teeth. If you open the mouth of a dog, you see the same. If you open your mouth, you don’t. You have canines that are the same length as your incisors. If you have long canine teeth, it allows you to do two things: one, it allows you to snatch your prey. The other thing it allows you to do is to pull away the hide. If a dog happens to catch a rabbit or another animal, it can very easily remove the hide. If a cat catches a squirrel, they have no trouble with that. But if a person does that, they will work all day and all night to get the skin off of an animal, because they don’t have long canine teeth anymore.

We also don’t have claws. Plus we’re not fast. Plus we don’t have very good vision, or good sense of smell. An owl is a predator and can detect a mouse at a tremendous distance. Dogs have a sense of smell much greater than ours and they’re much faster than we are. We have fairly dull senses, fairly slow locomotion. In our Olympic trials, we celebrate speeds that would be an embarrassment to a bird or a dog or another animal.

We have nothing to kill prey with and nothing to remove the hide with. So the question is when did that change come? It’s something like 3.5 million years ago that we lost our long canine teeth. And most of the great apes did, too—and they’re almost entirely vegetarian. Chimpanzees will eat a little bit of meat. But, they never eat dairy products, and no other animal would do that."
http://therumpus.net/2012/09/the-rumpus-interview-with-dr-neal-barnard/

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From the Journal of Human Evolution article: The human adaptations to meat eating: a reappraisal

"Gut measurements of primate species do not support the contention that human digestive tract is specialized for meat-eating, especially when taking into account allometric factors and their variations between folivores, frugivores and meat-eaters. The dietary status of the human species is that of an unspecialised frugivore, having a flexible diet that includes seeds and meat (omnivorous diet). "

Are Humans Designed To Eat Meat? : https://www.youtube.com/watch?v=sH-hs2v-UjI