Bullmastiff

This old English breed was developed as a guard dog in the 19th century to assist gamekeepers in their attempts to thwart poachers. The Bulldog and the Old English Mastiff are the ancestors of this breed, a combination designed to give the breed forbidding size and a courageous temperament. The Bullmastiff certainly possesses these qualities, combined with sufficient athleticism to chase away any intruder. In the early days the gamekeeper preferred brindle dogs for camouflage when working at night but the fawn, often with a black mask, is now more numerous.

Read the breed standard

Images for this breed

The Working breed group

Over the centuries these dogs were selectively bred to become guards and search and rescue dogs. Arguably, the working group consists of some of the most heroic canines in the world, aiding humans in many walks of life, including the Boxer, Great Dane and St. Bernard. This group consists of the real specialists in their field who excel in their line of work.

Colour Watch

Category 0: Breeds with no NBS colour registration options.

Read more about Colour Watch.

Breed Standard colours

Breed standard colour means that the colour is accepted within the breed standard and is a traditional and well-known colour in this breed.

Breed standard colours in this breed include:

Brindle
Brindle With Black Muzzle
Fawn
Fawn With Black Muzzle
Red
Red With Black Muzzle

Other colour/s

'Other' means you consider your puppy to be a colour not currently known within the breed and one that does not appear on either the breed standard or non-breed standard list. In this instance you would be directed through our registrations process to contact a breed club and/or council to support you on identifying and correctly listing the new colour.

Non-breed-standard colours

Non-breed-standard colour means that the colour is not accepted within the breed standard and whilst some dogs within the breed may be this colour it is advised to only select a dog that fits within the breed standards for all points.

Colour is only one consideration when picking a breed or individual dog, health and temperament should always be a priority over colour.

Whether you're considering buying a Bullmastiff puppy or breeding from your dog, it's important to understand the health issues that may affect the breed and how they can be managed or avoided.

Pre-breeding health screening

Good Practice schemes and tests

We strongly recommend that breeders, at a minimum, conduct these tests before breeding, as evidence indicates these conditions are a significant concern in the breed.

This breed can be affected by conformational concerns, more information can be found here.

Find out about a particular dog's results

Please visit our Health Test Results Finder to discover the DNA or screening scheme test results for any dog on The Kennel Club's Breed or Activity Register.

You can also view the inbreeding coefficient calculation for a puppy's parents, or for a dog you're thinking of breeding from.

DNA testing services

We don’t currently offer a breed-specific DNA testing package for this breed, but we have a wide selection of individual DNA tests available. To find out more and view our full selection, click here.

Breed health & conservation plan

Our breed health and conservations plans (BHCPs) use evidence and data to help us understand the health issues found in each pedigree dog breed. These plans help breeders and owners identify health and welfare problems and use information, health tests and health schemes to avoid passing on those problems to future puppies. They also support and provide breeders with tools and specialist expertise to help manage genetic diversity, understand the impacts of close breeding, and find the best ways to preserve the population of their breed.

Working together for the breed

We’ve worked with breed clubs and breed representatives to gather all available evidence to help us determine the priority concerns for the breed and decide how we can work together to manage and reduce these problems.

The full evidence base is available at the discretion of the breed clubs, however if you would like to seek access to the full report, please contact our health team.

Health (The Kennel Club)

More about health

Have any questions about health in your breed?

If you have any concerns about a particular health condition in your breed then you may wish to speak to your vet or you could contact your breed health co-ordinator.

Breed health co-ordinators are individuals working on behalf of breed clubs and councils who are advocates for the health and welfare of their chosen breed. They acts as a spokesperson on matters of health and will collaborate with The Kennel Club on any health concerns the breed may have.

To contact your breed health co-ordinator please email

Health (The Kennel Club)

Health issues in flat-faced dogs

Dogs with a flat, wide shaped head, are said to be brachycephalic (brachy, meaning short and cephalic, meaning head). This particular skull shape will often give these dogs a characteristic flattened face and a short muzzle. Although the shape of these dogs’ heads can make them look very cute, dogs with a very flat face and short muzzle have a higher risk of developing certain health issues associated with their features. Some of these issues are outlined below, but for more information on the health and welfare of flat-faced dogs, visit our brachycephalic hub.

Breathing difficulties

The soft tissue in the nose and throat of some brachycephalic dogs may be excessive for the airways, making it difficult for them to breathe normally (causing heavy panting or noisy breathing). Some dogs may also have narrow nostrils making it even more difficult to breathe.

More information can be found on:

our film about breathing problems in flat-faced dogs
from the University of Cambridge website
in our article on breathing problems in flat-faced dogs

Skin problems

Some brachycephalic dogs may have an excess of skin, which creates folds, especially around the front of the face. These folds can make a warm, moist environment which is perfect for bacteria and yeast to grow, possibly leading to infection and severe itching.

More information can be found in our article on skin problems in flat-faced dogs.

Want to buy a puppy responsibly?

Not all flat-faced dogs will have the health issues described, but it is important that if you are thinking of buying a puppy, that you take extra precautions.

There are not currently any additional breed specific restrictions in place for this breed.

Breed watch

Category 2

Particular points of concern for individual breeds may include features not specifically highlighted in the breed standard including current issues. In some breeds, features may be listed which, if exaggerated, might potentially affect the breed in the future.