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American Bull Mastiff – Dog Breed Guide

Breed summary

Size: Giant
Weight: NA
Height: NA
Longevity: 12
Bark Tendency: High
Aggression: High
Compatibility to other pets: High

Adopt an American Bull Mastiff, Dog Breed Guide


The American Bull Mastiff, the name alone is conveyed confidence and competence, which is what this breed exactly, is. They are not purebred, the ABM, a nick it shares with their cousins the American Bull Molloser, is a hybrid dog. They are mixtures of Alaunt varieties of German Mastiffs and American Bulldog or White English Bulldog bloodlines. The breed has some likeness with the Bandogs, but more identical in looks with the South African Boer Boel. Like all the mastiff dogs, American Bull Mastiff’s share the characteristics and traits of the Molosser dogs, huge, gritty and always armed with the serious poker face expression.

Official Name

American Bull Mastiff
The American Bull Mastiff is also known to be called the ABM and the Ambull Mastiff.


Date – 19th Century
Country – USA
Family / Group – Protection Dogs, Mastiff, Mollosser


Today, the ABM is still not considered as a breed of dogs. They are hybrids and only the Backwoods Bulldog Club & Registry and Dog Registry of America, Inc. recognizes the dog breed’s existence. When European immigrants began settling in Northern America during the 19th century, they brought various Bull and Mastiff breeds that are local to their home country. The very first breeds of Mastiffs and Bulldogs to be crossed came from Spain. Soon, German and Dutch Alaunt types of Mastiffs and Bulldogs were crossed together, seeing that dogs produced from this cross became not just superior guard dogs, but as herders of livestock as well. Whatever country they are from, as long as you cross Mastiffs and Bulldogs, it will produce the American Bull Mastiff hybrid and other similar variations which include the American Mastiff, Mastibull, American Bandogge Mastiff, American Masti-Bull and American Bandogge.


Fearless. Confident. Obedient.

The ideal Bullmastiff is fearless and confident, but obedient to his people’s wishes. Smart and reliable, he can be an independent thinker, yet he wants to please. American Bull Mastiff is a member of the protection groups of the breed, which were developed to be confident and dominant guard dogs. They have this dignified stance and dominating aura, but these highly trainable dogs always find pleasure working with their family or handlers. Typical behavioral issues that may occur are the dog’s tendency for dominant aggression, possessiveness and separation anxiety. But this can be corrected when trained early and firmly. Although a great watchdog, the American Bull Mastiff is a quiet guarding dog. Rarely barking, only doing so when it is needed. This quietness makes them ideal dogs for apartment and condo living environments.

Bred For

Protection and working dog services


The American Bull Mastiff is a great apartment dog for their quietness. Just be sure to have them sufficiently exercised. Homes with small yards are suitable and these dogs will be content.


Grooming regularly is not required, but that doesn’t mean the ABM wouldn’t enjoy it. Brushing them daily will make them extra happy. Their teeth should be cleaned periodically by their veterinarian.


Training is relatively easy as these types of dog breeds are naturally submissive. But they do need competent. Dominant and firm handlers which are worthy of their submission.


Preventative measures against fleas, ticks and heartworms should be done during their puppy phase. As a member of the mastiff line, the American Bull Mastiff inherits the ailments prone to these large dogs. They are


To keep ABM pets in top shape both mentally and physically, brisk walking is recommended done twice every day.



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