Miniature Fox Terriers are closely related to the Toy Fox Terrier, a breed that developed along similar lines in the United States. Some Toy Fox Terrier owners can trace their dogs’ pedigrees to 'Foiler', the first Fox Terrier registered by the Kennel Club in Britain, circa 1875–6. Other related breeds include the Jack Russell Terrier, the Rat Terrier, and the Tenterfield Terrier. Bred for hunting rodents (rats, mice) and rabbits principally, these dogs are known for their speed and agility. With the ruthlessness of their attack on rodent pest species and their ability to squeeze into and out of tight spaces, they have made themselves an indispensable part of many Australian farms since the 19th Century. Miniature Fox Terriers have proved well-suited to being domestic pets in more urban environments (according to the breed club).