It would be an interesting study if ALL dog bites/attacks were reported. My neighbor had a cockerspaniel (sp?) and some other tiny mutt. These dogs were 'viscious' and bit anyone who came near them. The difference was that the worst these dogs could do is nip at your ankles and could only go through your skin if they were lucky.

If a Pit, Tot or any other of the 'fighting dogs' acted the exact same way, then a lot of damage would likely be done to the people they bit. My oldest was 'attacked' by a poodle she was teasing once. It was more funny to see the little thing go after my daughter than scary. However, if it were a pit, then it would have been a totally different scenario.

I don't know if one dog breed is really more likely to attack or bite than another (I haven't seen any research or heard a compelling argument that would support that notion), however I do know that certain breeds will do a lot more damage than others if they do bite/attack. And that's what makes them more dangerous. It's like playing with a BB-gun or a real one. A lot of accidental shootings happen with both, however, only the real gun accidents generally get reported to the police or cause enough harm to go to the hospital.