Are both Jack Russell Terrier and Bullmastiff types of dogs?
Bullmastiff The Bullmastiff is a large-sized breed of domestic dog, with a solid build and a short muzzle. The Bullmastiff shares the characteristics of molosser dogs, and was originally developed by 19th-century gamekeepers to guard estates. The breed's bloodlines are drawn from the English Mastiff and the extinct Old English Bulldog. It was recognized as a purebred dog by the English Kennel Club in 1924. They are quiet dogs and very rarely bark.
Toy Bulldog The Toy Bulldog is an extinct dog breed that existed in England at 18th and early 19th centuries. Breeders were working in two different directions to create this breed. One was to downsize the Bulldog. This was not very successful due to complications with breeding sub-regular size dogs of this breed together. The dwarf size Bulldog puppies were and still are occasionally born out of regular size parents, but they were neither the healthiest, nor the most fertile dogs. They often produced regular-size puppies. Thus, this version of the breed had never been established.