Pitbulls

The American Pit Bull Terrier is the product of interbreeding between terrier and a now-extinct breed of bulldogs to produce a dog that combined the gameness of the terrier with the strength and athleticism of the bulldog. These dogs were initially bred in England, Ireland, and Scotland, and arrived in the United States with immigrants from these countries. In the United States these dogs were used as catch dogs for semi-wild cattle and hogs, to hunt, to drive livestock, and as family companions; however, some were selectively bred for their fighting prowess, and starting in the early 20th century they began to replace the bull terrier as the "dog of choice" for dog fighting in the United States.