The Bullmastiff is a large-size breed of domestic dog, with a solid and a short muzzle. The Bullmastiff shares the features of molosser dogs, and was originally developed by 19th-century gamekeepers to guard estates. The bloodlines of the breed are attracted from the English Mastiff and the extinct Old English Bulldog. It was recognized as a purebred dog by the English Kennel Club in 1924.
Bred by English gamekeepers in the 19th century to help gamekeepers or English wardens guard capture poachers and estates. As a result, the Bullmastiff is referred to as the Gamekeeper’s Night Dog. The favorite colour, by gamekeepers, was brindle as this colour works as a more effective camouflage, especially at night. They bark considerably less often than other breeds; yet, they will bark on alarm.