Not the ones people have posted about here. Do you have any proof of that? I would be willing to bet that a dog fed a diet of mostly healthy meat would outlive an identical dog fed an exclusive vegetarian diet. Some animals are meat eaters, or at least predominantly carnivores. It is the way the food chain works, like it or not and regardless of how admirable one's concern for other animals may be (although I keep thinking of the fact that plants are also life forms)..
How about the fish you have posted about? I see bass and other fish swim straight through yards and yards of vegetation to eat another fish.
If I were swimming in the ocean eating an apple and holding a fish on a stringer and saw a great white headed my way, it wouldn't be the apple I tossed to him.