The Bullmastiff is British breed of dog of mastiff type, with a solid build and a short muzzle. It was developed as a guard dog in the nineteenth century by cross-breeding the English Mastiff with the now-extinct Old English Bulldog. It was recognised as a breed by The Kennel Club in 1924.The Bullmastiff is a large dog. Bitches stand some 61–66 cm at the withers, and usually weigh 41–50 kg; on average, dogs stand about 3 cm taller and weigh 9 kg more

The origins of the Bullmastiff are unclear. In the nineteenth century, in some regions of England, the Old English Mastiff and English Bulldog were commonly inter-bred to produce dogs suitable for work guarding people and their property.

Height: Dogs 64–69 cm (25–27 in)
Bitches: 61–66 cm (24–26 in)
Weight: Dogs 50–59 kg (110–130 lb)
Bitches: 41–50 kg (90–110 lb)
Coat: Short and weather resistant
Colour: Any shade of brindleredfawn
Life span: 8-12 years