What are some things that are good for humans, but bad for animals?

Chocolate is good for people (dark chocolate with low amounts of sugar but still) however its bad for dogs and many other types of animals. Blood doping helps humans run faster and is a quick way to cheat in soprts, but it can kill a horse. (It's not good for humans either because its imoral but it doesn't affect us in the same way which is what you are looking for). Oh, birds are able to digest lots of berries that we can't digest and would be poisonous for humans to eat. That's all I can think of right now. Interesting quesiton. You are probably going to need a more reputable source though...

I know that Grapes are healthy for humans, but harmful to dogs. I read somewhere years ago that a small dog should not eat chocolate half the size of its heart (or whole size of its heart?) because then the dog can kill itself if it runs around and its blood pressure raises. U can go here for more info on chocolate on dogs-> "Naturally, larger dogs can eat more chocolate, since they have a bigger (and more powerful) immune system that can fight it away. Smaller dogs become intoxicated more easily, since they have a smaller (thus weaker) immune system. The more pure the chocolate is, the more of a hazard it is to the dog -- and thus, the less amount of it a dog can have before becoming significantly intoxicated. White chocolate, and other forms of artificially-flavored-enhanced chocolate, are the least of the threats; dogs can actually eat quite a large amount of this sort of chocolate before becoming poisoned. However, milk chocolate, sweetened chocolate, and semi-sweetened chocolate are larger threats; dogs can eat small amounts of these. Pure chocolate (baking chocolate, for example) is very dangerous to a dog's health; it intoxicates them very easily!" Read more: http://wiki.answers.com/Q/What_happens_when_a_dog_eats_chocolate#ixzz16oRsDXlC