Pit bulls were originally developed by cross breeding bull-baiting dogs and terriers.
 Pit bull-type dogs, like other terriers, hunting and bull-baiting breeds, can exhibit a bite, hold, and shake behavior and at times refuse to release
 Proponents of the breed and advocates of regulation have engaged in a nature-versus-nurture debate over whether apparent aggressive tendencies in pit bulls may be appropriately attributed to owners' care for the dog or inherent qualities

