| Bullmastiff Dog | |||||||||||||||||||||||||
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| Origin | England | ||||||||||||||||||||||||
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| Dog (domestic dog) | |||||||||||||||||||||||||
TheBullmastiff is an Englishbreed ofdog ofmastiff type and large size, with a solid build and a short muzzle. It was developed as aguard dog in the nineteenth century bycross-breeding theEnglish Mastiff with the now-extinctOld English Bulldog. It was recognised as a breed byThe Kennel Club in 1924.
The origins of the Bullmastiff are unclear. In the 18th century, in some regions of England, theEnglish Mastiff andOld English Bulldog were commonlyinter-bred to produce dogs suitable for guarding people and their property. By the beginning of the 20th century, this cross-breed was in widespread use as an aid togamekeepers in the control ofpoaching.[2] They were bred for strength, size and speed using a cross of the tough, heavy and aggressive 19th century bulldog with the large, strong, less aggressive mastiff.[3] As a result, the Bullmastiff is known as the Gamekeeper's Night Dog.
The Bullmastiff was recognised as a breed byThe Kennel Club in 1924. Dogs had to have a minimum of four generations of descent from Bullmastiff stock without input from either Bulldog or Mastiff; cross-bred animals could not be registered.[2] TheAmerican Kennel Club recognised it in 1934.[4]
It was definitively accepted by theFédération Cynologique Internationale in 1955.[5]
In 1928, theDe Beers diamond mining company imported Bullmastiffs to South Africa to guard the mines.[6]
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The Bullmastiff is a large dog. Bitches stand some61–66 cm at thewithers, and usually weigh41–50 kg; on average, dogs stand about3 cm taller and weigh9 kg more.[1]
The coat may be fawn, red, or brindle, in any shade; some limited white marking on the chest is allowed. The muzzle is black, becoming paler towards the eyes.[1]
The Bullmastiff isbrachycephalic, flat-faced and short-muzzled, but this does not affect its breathing.[7][failed verification]
A 2024 UK study found a life expectancy of 10.2 years for the breed compared to an average of 12.7 for purebreeds and 12 forcrossbreeds.[8]
Health concerns within the breed include hip and elbow dysplasia, progressive retinal atrophy, bloat, and cancer, with a relatively high incidence of lymphoma and mast cell tumours.[9][10][11] Bullmastiffs are prone to certain hereditary diseases, including:
Anautosomal dominant form ofprogressive retinal atrophy is common in the breed. A mutation to theRHO gene is responsible.[15]
Bullmastiffs also are prone to ear infections.[16]
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