Pit bull

11) Pit bull

Pit bulls were created by breeding bulldogs and terriers together to produce a dog that combined the agility of the terrier with the strength of the bulldog. They were used as catch dogs in America for semi-wild cattle and hogs, to hunt, and drive livestock, and as family companions. They commonly fill the roles of companion dog, police dog and therapy dog, and some have been selectively bred for fighting. (Wikipedia