Group: Working Dog Group

Origin: Great Britain


    – Males: 25-27 in (63-69 cm).
    – Females: 24-26 in (61-66 cm).


    – Males: 110-130 lbs (50-59 kg).
    – Females: 100-120 lbs (45-55 kg). Females are feminine in appearance, of somewhat lighter bone structure than the male, but should still convey strength.
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Breed Profile

The Bullmastiff comes from a cross between the Bulldog and the Mastiff. Developed for the pupose of having a dog who could guard like a Mastiff, have the courage of a Bulldog, and be faster and more agile than the Mastiff. He was mostly used by gamekeepers in Britain to warn them of the presence of poachers and help them in a fight. Known as the “gamekeeper’s nightdog”, he was a silent, agile dog that could attack on command, knock down a man and hold him without mauling or biting. He has also been used as a police and army dog and as a guard dog by diamond companies in South Africa.

The Bullmastiff has an aristocratic, attentive and intelligent appearance. Powerful, active, alert, fearless and courageous, he is however, docile and laid back with those he knows. The Bullmastiff is extremely devoted, loyal, and affectionate to his family. Today, the breed is primarily a companion dog who is an excellent guard dog. With his natural guarding abilities and a somewhat stubborn nature, the Bullmastiff is not for everyone and early socialization and training is very important for this breed.

Health Issues

The number one killer of Bullmastiffs, along with many other breeds, is cancer. Some of the most common health concerns found in this breed are:

If you are considering the adoption of a Bullmastiff puppy, or any breed, it is very important to be selective in choosing a responsible and reputable breeder. Ensure that the prospective puppy’s parents have all health clearances. Breeding of any dog should not be done until after they have been proven to be free of evidence of significant hereditary diseases. (For more information on selecting a breeder, see the articles on the General Information page.)

Recommended Health Screening:

For the Bullmastiff, the CHICNote 1 database includes health screenings for:

  • Hip Dysplasia
  • Elbow Dysplasia
  • Eye Examination by a board Ophthalmologist
  • Congenital Cardiac Database
  • Autoimmune Thyroiditis
  • Also listed as “optional” are: Progressive Retinal Atrophy (PRA) DNA Test; and Kidney Disease

Additional Health Resources:


Grooming Information

  • Grooming — This section of the Canada’s Guide to Dogs website includes tips, articles and information covering all aspects of dog grooming along with a listing of Groomers from across Canada.


Training Resources

  • Training — For training information, see this growing section of the Canada’s Guide to Dogs website for tips, articles, as well as listings of training centres across Canada.


Additional Information


*NOTE 1: CHIC – The Canine Health Information Center “is a database of consolidated health screening results from multiple sources. Co-sponsored by the Orthopedic Foundation for Animals (OFA) and the American Kennel Club (AKC) Canine Health Foundation, CHIC works with parent clubs to identify health screening protocols appropriate for individual breeds. Dogs tested in accordance with the parent club established requirements, that have their results registered and made available in the public domain are issued CHIC numbers.” To learn more, visit: www.caninehealthinfo.org

*NOTE 2: The Fédération Cynologique International (FCI) is the World Canine Organization, which includes 91 members and contract partners (one member per country) that each issue their own pedigrees and train their own judges. The FCI recognizes 344 breeds, with each being the “property” of a specific country. The “owner” countries write the standards of these breeds in co-operation with the Standards and Scientific Commissions of the FCI, and the translation and updating are carried out by the FCI. The FCI is not a breed registry nor does it issue pedigrees.

Breed Listing

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