Pitbulls were originally known as nanny dogs - because they are great with children and they will protect "their" children no matter what. They will literally put their own life on the line without giving it a second thought.
The nanny dog doing his duty! Pit Bulls were referred to as the "nanny dog" throughout the 1800s. If you had children, Pitties were the dogs to have. They were alert and protective of their charges and would never fail to keep their people safe; or die trying.