What's interesting, is that small dogs are FAR more likely to bite than big ones, in the long run. Because people are less apt to be as diligent about training them than they are with their larger counterparts.
It's just sad that some large dog breeds, like pitties, are hated. Sure a big dog DOES do more damage when they bite, this is true, but some breeds, it seems, sadly, are more apt to be reported if they bite, and splashed all over the news, than others.