Bull Mastweiler

Dog Breed Profile

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Bull Mastweiler History

The Bullmastiff is a type of mastiff, a medium to large-sized working dog that was originally developed in the United Kingdom. Originally, the Bullmastiff was used as a guardian and as a protector of livestock. Because of its large size, strength and courage, the Bullmastiff was also used for bullbaiting, a sport in which bulls were baited or provoked into aggression by dogs and were then taunted and fought for sport. The modern-day Bulldog is descended from Old English Bulldogs, which were heavier and larger than the modern English Bulldog. The Bullmastiff was one of the earliest types of bulldog and its name derives from “Mastin”, a slang term for “Masculine”. The modern-day pure-bred English Bulldog is actually a descendent of the now extinct English White Terrier. The Bullmastiff was also once a popular cross-breed between an English Bulldog and a Mastiff.

Time of Origin


Country of Origin


Bull Mastweiler Physical Characteristics

The Bull Mastiff is a large, heavy, large-sized breed of dog that typically stands between 27 and 31 inches at the withers and 128 to 281 lbs in weight. The breed has a muscular, powerful body and a massive head. They have a thick, coarse, and harsh outer coat of 1 to 2 inches, and a soft, thick undercoat. Their skin color is typically either liver, red, fawn, brindle, or white. They have a soulful, intelligent, calm temperament.

Eye Colors


Nose Colors


Coat Colors


Height Range

Male Height Range: 24 – 27 inches

Female Height Range: 23 – 25 inches

Weight Range

Male Weight Range: 90 – 130 lbs

Female Weight Range: 80 – 120 lbs

Bull Mastweiler Health

Description of breed health.


10-12 yrs

Bull Mastweiler Health Concerns

Hip Dysplasia, Bloat, Osteochondritis Dissecans, Elbow, Hypothyroidism, Retinal Detachment

Bull Mastweiler Temperament and Behaviour

The Bull Mastweiler is a highly intelligent and sensitive breed. They are devoted to their owners and protective of their families. They are wary of strangers, but can be very loving to those they know. They are alert and watchful, and will bark at anything they perceive as a threat to their family. They are calm, but can become aggressive if they feel threatened.

Bull Mastweiler Activity Requirements

The Bull-Masto (or “Bull-Moose Dog”) is a relatively new hybrid dog that was created by crossing the American Pitbull Terrier with the Neapolitan Mastiff. They are large, muscular, and gentle. While they are not a very active or intense breed, they do require regular exercise. They can become destructive if bored, so it is important to provide your Bull-Masto with activities and toys they can play with throughout the day. They need about an hour of exercise and playtime each day. This can be done in several short sessions or one long session. When walking your Bull-Masto, remember to use a strong leash and be careful around other dogs.

Miles Per Day


Activity Per Day


Daily Food


Kennel Club Recognition

American Kennel Club

Not Recognized

Bull Mastweiler is part of the Unclassified group.

Visit the American Kennel Club website.

The Kennel Club

Not Recognized

Bull Mastweiler is part of the Unclassified group.

Visit the Kennel Club website.

Australian National Kennel Council

Not Recognized

Bull Mastweiler is part of the Unclassified group.

Visit the Australian National Kennel Council website.

Canadian Kennel Club

Not Recognized

Bull Mastweiler is part of the Unclassified group.

Visit the Canadian Kennel Club website.