Dog Breeds Cat BreedsPet Names Dog TrainingForumPet Health

BACK to Dog Breed Listing


Family cross between the English Mastiff and the Old English Bulldog
Life Span 9-12 years
Avg Size of Male: Height: 25 - 27 inches, Weight: 110 pounds
Avg Size of Female: Height: 24 - 26 inches, Weight: 100 pounds
Original Function: find and immobilise poachers
Overall Rating (out of 5)
The Bullmastiff is a powerful dog, said to be a cross between the English Mastiff and the Old English Bulldog. Originally bred to find and immobilise poachers, the breed has proven its value as a family pet.

Adult male bullmastiffs should be 25 to 27 inches tall (63.5 to 68.5 cm) at the withers and 110 to 135 pounds (50 to 60 kg). Females typically reach 24 to 26 inches (61 to 66 cm) at the withers, and 100 to 120 pounds (45 to 55 kg). Exceeding these dimensions is discourged by breeders as they are too big to do their jobs. Any shade of brindle, fawn, or red is allowed as long as the colour is pure and clear. In the United States, however, there is no mention in the standard of the colour being "pure and clear". The fawn is a light tan or blond colour, while the red is a richer, red-brown. This can range from a deep red to a light red merging with the fawn sometimes described as a red-fawn. A slight white marking on the chest is permissible, but other white markings are undesirable. A black muzzle is essential, toning off towards the eyes, with dark markings around eyes contributing to the expression.


The Bullmastiff is courageous, loyal, calm, and loving with those it knows. It has a very strong protective instinct and will defend its owners against anything it perceives as a threat. However, it does not normally attack to protect. Instead, it knocks the intruder over with its massive size and pins them to the ground, or, will simply stand in front of the stranger/intruder and refuse to let them pass. Bullmastiffs become intensely attached to their families and do best when they can live inside with them. Their protective instinct combined with their great size and natural wariness of strangers means that early socialization is a must. The Bullmastiff may or may not get along well with other dogs. Occasionally, females in heat will also not get along with other females. The Bullmastiff gets along well with children and is very loving towards them. Parental supervision must be maintained when they are with children because of their size and may knock smaller children down accidentally.

Bullmastiffs generally get on well with other pets in the family, but can be unfriendly towards strange dogs and other dogs of the same sex, so you need to make sure your Bullmastiff is well socialised and trained.


The Bullmastiff is a short-haired dog breed and his slightly rough coat is easy to groom. Comb and brush with a firm bristle brush, and shampoo only when necessary. There is little shedding with this breed. Check the paws regularly because they carry a lot of weight, and trim the nails.


Bullmastiffs are prone to certain hereditary diseases. These include: Hip dysplasia Elbow dysplasia Entropion Hypothyroidism Lymphoma cancer Progressive retinal atrophy, a particular problem since the trait is an autosomal dominant one.


Bred by English gamekeepers in the 1800s to tackle poachers, the Bullmastiff (also known as a Gamekeeper's Night Dog) was a cross of 40% English Bulldog for its agility and tenacity (which was the Old English Bulldog, not the short, fat Bulldog of today) and 60% English Mastiff for its size, strength and loyalty. They bark much less often than other breeds, but when they bark they will make your head turn, as it is dark and hollow sounding. The Bullmastiff was recognized as a pure-bred dog in 1924 by the English Kennel Club. In October, 1933, The American Kennel Club recognized the Bullmastiff. The first standard for the breed was approved in 1935. The standard has undergone several revisions since then. The most current version is available on the AKC web site.






Copyright " - Find Your Perfect Pet" 2006