The ancestors of modern pit bulls, English and French bulldogs, and other related breeds were powerful mastiffs bred for farm work. Specifically, these dogs accompanied farmers into the fields to assist with bringing dangerous bulls in for breeding, castration, or slaughter. The dogs, known generally as bulldogs, protected the farmer by subduing the bull if it attempted to gore him. Typically a dog would do this by biting the bull on the nose and holding on until the bull submitted. Because of the nature of their job, bulldogs were bred to have powerful jaws, muscular bodies, and the resolve to hold onto a violently-struggling bull, even when injured.