The toughest dog breed in America is sometimes said to be the American Pit Bull Terrier, which is commonly referred to as the pit bull. The term "pit bull," however, is not specific but also covers the breeds American Staffordshire Terrier and Staffordshire Bull Terrier.
Though pit bulls were originally bred for baiting bears and bulls and later as farm dogs, many have been used in dog fighting rings across the world. Pit bull owners often argue that the breed is misunderstood, stating that aggressive, angry pit bulls are trained to behave this way. In fact, many families own pit bulls as family pets and claim them to be obedient and gentle. This obedience paired with the breed's strength is precisely what lures unscrupulous people to train them to fight.