Question: Are both Jack Russell Terrier and Bullmastiff types of dogs?
Context: Fox Terriers are two different breeds of the terrier dog type: the Smooth Fox Terrier and the Wire Fox Terrier.  Both of these breeds originated in the 19th century from a handful of dogs who are descended from earlier varieties of British terriers, and are related to other modern white terrier breeds.  In addition, a number of breeds have diverged from these two main types of fox terrier and have been recognised separately, including the Jack Russell Terrier, Miniature Fox Terrier and Rat Terrier.  The Wire and Smooth Fox Terriers share similar characteristics, the main differences being in the coat and markings.  They have been successful in conformation shows, more prominently in America than their homeland. The American Russell Terrier Club (formerly named the English Jack Russell Terrier Club), founded by JoAnn Stoll in 1995, was the first registry in the United States to maintain the Russell Terrier as a separate breed from the Parson Russell Terrier.  The American Jack Russell Terrier Club is affiliated with both the United Kennel Club and the American Kennel Club.  The purpose of the early founders was to establish a registry for the perpetuation and development of the Russell Terrier as a pure strain of working Jack Russell Terrier keeping their blood and type pure within the registry to works towards Kennel Club recognition as an official breed in the US.  On January 1, 2001, the United Kennel Club recognized the Russell Terrier as an official breed, designating only the stock from the American Russell Terrier Club as Foundation stock for the UKC Russell Terrier.  In 2004 the American Russell Terrier Club submitted an official request to include the American Russell Terrier Club stock into the AKC FSS Program to work towards becoming an official breed under the perimeters.  On December 8, 2004, the AKC officially accepted the Russell Terrier. The Jack Russell Terrier is a small terrier that has its origins in fox hunting.  It is principally white-bodied and smooth, rough or broken-coated but can be any colour. Old Jock (1859–1871), was a Fox Terrier famous during the late 19th and early 20th centuries.  A mostly white dog, he ran briefly with a hunting kennel before becoming a show dog, most notably with a victory at the show which popularised the Fox Terrier.  His main show rivalry was with a dog named Tartar, and along with a dog named Trap, the three were popular sires of the Fox Terrier breed.  He was also involved in the early formation of the Jack Russell Terrier and the Dandie Dinmont Terrier breeds. The Jack Russell Terrier Club of America (JRTCA) is the largest Jack Russell Terrier club and registry in the world, and is the National Breed Club and Registry for the Jack Russell Terrier in the United States. John "Jack" Russell (21 December 1795 – 28 April 1883), known as "The Sporting Parson", vicar of Swimbridge and rector of Black Torrington in North Devon, was an enthusiastic fox-hunter and dog breeder, who developed the Jack Russell Terrier, a variety of the Fox Terrier breed. The Russell Terrier is a predominantly white working terrier with an instinct to hunt prey underground.  The breed was derived from the Reverend John Russell's working terrier strains that were used in the 19th century for fox hunting.  The Reverend's fox working strains were much smaller than the Show Fox Terrier and remained working terriers.  The size of the Russell Terrier (10″ to 12″) combined with a small flexible, spannable chest makes it an ideal size to work efficiently underground.  Their unique rectangular body shape with the body being of slightly longer length than the leg makes them distinctly different from the Parson Russell Terrier and the JRTCA Jack Russell Terrier. Soccer (May 17, 1988 – June 26, 2001) was a Jack Russell Terrier dog actor.  A veteran of many television commercials for companies like Nike Athletics and Mighty Dog Dog Food, he became famous portraying the talking dog "Wishbone" in the PBS television series of the same name.  Chosen from out of more than 100 dogs who auditioned for the role, Soccer appeared in almost every episode of the show during its 1995-1998 run.  He lived with his trainer, Jackie Martin Kaptan, on the Plano, Texas ranch where the "Wishbone" series was filmed and was buried there after his 2001 death.  Soccer's role as Wishbone was considered by many to be one of the most beloved TV dogs of the 1990s. 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. The Parson Russell Terrier is a breed of small white terrier that was the original Fox Terrier of the 18th century.  The breed is named after the person credited with the creation of this type of dog, the Reverend John "Jack" Russell.  It is the recognised conformation show variety of the Jack Russell Terrier and was first recognised in 1990 in the United Kingdom as the Parson Jack Russell Terrier.  In America, it was first recognised as the Jack Russell Terrier in 1997.  The name was changed to its current form in 1999 in the UK and by 2008 all international kennel clubs recognised it under the new name.
Answer: yes