"There are three kinds of lies: Lies, damn lies and statistics." I think Mark Twain said that. If one is going to use statistics like that it should be kept in mind the popularity of certain breeds - Pits are extremely popular, so their biting incidence would be greater. There is also the method of collection to be looked at - many biting incidents are not reported if it's not that serious - unfortunately most biting incidents with pits will be serious simply as a function of the dog's strength. Also the fact that many people who shouldn't have anything more potentially dangerous than an aged hamster chose pits because of their athleticism. They are not responsible owners and the dogs are poorly (to say the least) raised. I'm sure that the statistics at some point in the past would have shown both dobermans and shepherds as being the Bitin'-est Dogs when they were The Dogs to have.