A rat terrier-pit bull mix is a cross between a rat terrier and an American pit bull terrier. The physical and mental characteristics of hybrid dogs are unpredictable due to the wide variety of traits they can inherit from both parents.
Both the rat terrier and the American pit bull terrier are muscular dogs, although the rat terrier is much smaller. The rat terrier and the American pit bull terrier are known for their intelligence, obedience and affection. As terriers, these dogs are protective and fierce when they sense that their families are threatened, making them natural guard dogs. The rat terrier is described as easy to train, while the American pit bull terrier does best with a firm, assertive owner.