what we're dealing with here is regression. the loyal, loving pit bull of your family, suddenly, (and they all say he was never like this before) injures someone and nothing can be done to prevent it , other than keeping kids away from the dog.
rottweilers, in my opinion, have surpassed pits, because of their growing reputation to regress to the wild state in a pack. They killed a 10 year old boy who raised them.
there is no dog owner that thinks their baby will kill a member of the family, but it happens.
my mom owns chow-chows, one of her chows bit a child on the face and caused some emotional and physical scarring, and she knew teh dog was mean. the child ws visiting, stepped on teh dog and then it was over just like that. that dog was put down, as was one of her other ones that bit my dad on the hand.
chows, rotties, pitts, dobies, all too dangerous for children to be left alone with.(im sure there are more, akitas, etc)
~lwr~