The Bullmastiff is a breed of dog that originated in England. Just as their name suggests, it was developed from a cross between the old English Bulldog and Mastiff.


Bullmastiffs have a sturdy and agile body. They stand between 24-27 inches and weigh in at 100-130 pounds. They have a short coat that is red, fawn, or brindle, often with black markings on the head and muzzle.

Breeding for the Bullmastiff began in the 1800s by English gamekeepers of large estates and game preserves. They needed a dog that could help them keep the land free of poachers. The Mastiff was not quite aggressive enough and lacked the speed for pursuit, while the old English Bulldog was overly ferocious and small. By crossing the two breeds they developed the dog seen today, keeping the bloodline 60% Mastiff to only 40% Bulldog. Bullmastiffs are still used as guard dogs worldwide, particularly in South African diamond mines.

The Bullmastiff is a loyal and dependable breed, both as a watchdog and companion. Although they have the appearance of a fighter, they prefer to hold an intruder at bay and wait for their owner. They do well with children, get along well with most pets and other dogs if properly socialized, and crave human companionship. Some dogs can be difficult to train; a Bullmastiff should have a firm handler.

The life expectancy of a Bull Mastiff is between 10-12 years. Some hereditary diseases include cancer, hip dysplasia, and tumors. This breed is prone to bloat, and should be feed two or three small meals a day to help prevent it from occurring.

Bullmastiffs can live in an apartment only if it is regularly exercised. They are fairly inactive indoors and require a daily walk even if they have a yard. Bullmastiffs can be lazy and easily put on weight if overfed.

The coat of a Bullmastiff requires little grooming, just a quick brush when necessary. They are average shedders.