PitBull

Pit bull is an umbrella term for several types of dog believed to have descended from bull and terriers. In the United States, the term is usually considered to include the American Pit Bull Terrier, American Staffordshire Terrier, Staffordshire Bull Terrier, American Bully, and sometimes the Bull Terrier, along with any crossbred dog that shares certain physical characteristics with these breeds.... (Wikipedia)