The American pit bull terrier is the product of interbreeding between terriers and a 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 and arrived in the United States with the founders. 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. Some have been selectively bred for their fighting prowess.