The majority of supposed pit bull attacks are not actually done by pit bulls, but breeds that look similar. Most of the reports of the lady who had a face transplant said that a pit bull was the dog responsible -- however, it was her pet labrador retriever. Most surveys will tell you that the labrador retriever is the #1 biter in North America.

I hate it when people say that pit bulls are genetically predisposed to attack -- they have no more predispostion than any other breed. They are terriers. They were bred to bait bulls and kill rats. They were NOT bred to fight until later on. Fighting is not something you can breed. Unlike pit bulls, boxers WERE originally bred to fight, and look at them. They are younger than the pit bull and yet they seem to be fine. Pit bulls are terriers --- like all other terriers, they do have a tendency towards being dominant --- this is something that can be fixed with training. And, like all other terriers, they are bred to hold on. Pitties were bred to bait bulls --- if they let go of that bull, they are dead. They do not "lock" their jaws --- it is in their instinct, as with all other terriers, to hold on or die. Even a jack russell will hold on for dear life -- that rat could kill it. But pit bulls were also bred to be family dogs. They slept in the children's beds. And so any dog that showed any tendency towards aggression towards humans was culled. Nowadays of course, with backyard breeders and puppy mills, we do not always have this. But with good breeders, we do. It is not true that mixing five generations of good dogs can create an aggressive litter. A good breeder mixes temperments properly. A complete outcross is more unpredictable in temperment than a linebreeding, but the breeder would have done their research on similar outcrosses.