我小的时候养过狗， 但是那时候人还没巧克力吃呢？ 关于你说的，我不知道是真还是假

这里我找到一个说法, 请参考 http://abcnews.go.com/GMA/Pets/myth-busting-pet-dangers/story?id=11478985，

我摘取一段 （好像是谣言）
Small Amounts of Chocolate Are Deadly to Dogs: Myth

Many pet owners think that just one bite of chocolate kill your dog, but the truth is, a large dog would have to eat a lot of milk chocolate to get sick -- more than a couple of pounds.

But even though chocolate is not necessarily deadly, that doesn't mean you should give it out as treats.

"The rule of thumb is, the darker the chocolate, and the smaller the dog, the more dangerous it is," Becker said.