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.