Purebred is a term used to describe animals that have been bred over many generations to have certain characteristics. Thoroughbreds are a type of horse that has been bred for speed and agility, and is most commonly used in horse racing. The Brussels Griffon is a small breed of dog that originated in Belgium and is known for its intelligence and loyalty. The Scottish Terrier is a small breed of dog that originated in Scotland and is known for its courage and strength. All three of these breeds are considered purebreds due to their long history of selective breeding.