Bull Mastiff

Temperament: Affectionate, Loyal, Brave

  • Height: 25-27 inches (male), 24-26 inches (female)
  • Weight: 110-130 pounds (male), 100-120 pounds (female)
  • Life Expectancy: 7-9 years
  • Group: Working Group 
 Fearless at work, docile at home, the Bull-mastiff is a large, muscular guarder who pursued and held poachers in Merry Old England—merry, we suppose, for everyone but poachers. Bull-mastiffs are the result of Bulldog and Mastiff crosses. 


That of a symmetrical animal, showing great strength, endurance, and alertness; powerfully built but active. The foundation breeding was 60 percent Mastiff and 40 percent Bulldog. The breed was developed in England by gamekeepers for protection against poachers.

About the Bull-mastiff

The Bull-mastiff isn’t quite as large as his close cousin the Mastiff. Still, standing as high as 27 inches at the shoulder and weighing between 100 and 130 pounds, this is still a whole lot of dog. After the first impression made by the Bull-mastiff’s size, it is the large, broad head that conveys the breed’s essence: the dark eyes, high-set V-shaped ears, and broad, deep muzzle all combine to present the intelligence, alertness, and confidence that make the Bull-mastiff a world-class protector and family companion. Coats come in fawn, red, or brindle.

These are biddable and reliable creatures, but as with any large guarding dog, owners must begin training and socialisation early, while the puppy is still small enough to control.

NUTRITION Most Bull-mastiff breeders advise feeding adult dog food or large-breed puppy food for puppies in order to ensure slow and steady growth. Several small meals are best for puppies, and two meals daily is a good routine for adults, so dogs don’t have to digest too much food at each meal. Because of the risk of bloat, exercise is discouraged immediately before and after eating. Bull-mastiffs should be kept lean, especially as puppies, as they grow very rapidly, which can tax their systems.

GROOMING Seasonal shedding is to be expected, though unusual hair loss should be noted as a possible problem. A balanced diet and a healthy environment are most important for coat health. Frequent grooming ensures that shedding can be managed, and dogs should be bathed as needed. The skin and coat should be monitored in order to ensure that dryness or oiliness are not issues. These can be related to diet, and sometimes to allergies.

EXERCISE Bull-mastiffs enjoy daily exercise. Some are more sedentary, while others are very active by nature, but moderate exercise should be encouraged. Brisk walks and outdoor play are favourites of the breed, although secure fencing is a must for outdoor areas. Fencing is critical to ensure that the dog is safely contained and so strangers and unfamiliar animals do not intrude on the Bull-mastiff’s territory. Puppies should not be overexercised, especially during periods of rapid growth. Bull-mastiffs are not the ideal breed for people who want a canine running partner, but they are great walking companions.

TRAINING Early training and socialisation are critical for Bull-mastiff puppies. The breed can be quite strong willed, and dogs and owners will both benefit from training regimens instilled in puppy-hood. Rules and routines should be put in place early and adhered to as dogs grow up. Many breeders will encourage new owners to enrol in local puppy classes in order to ensure that puppies are exposed to other dogs and that owners have access to training assistance and information. Bull-mastiffs can excel in agility, obedience, rally, even scent work and tracking, so training should begin immediately and be a part of the lifelong bond between dog and owner.

HEALTH Bull-mastiffs are a large breed with heavy bone. Breeders strive to adhere to the standard and to avoid overdone animals. In order to do the job of a guard dog, this working breed must be mentally and physically sound. Responsible Bull-mastiff breeders support the American Bull-mastiff Association Health & Research Committee, and screen their breeding stock for cardiac issues, hip and elbow dysplasia, hypothyroidism and eye problems. Like many dogs, both purebred and not, Bull-mastiffs can develop cancer as well as bloat, a sudden and life-threatening swelling of the abdomen; owners should educate themselves about its symptoms and what to do should bloat occur. Heredity and environment play roles in the health of the breed, so breeders and owners must work together in order to breed and raise healthy dogs.

Recommended Health Tests from the National Breed Club:

  1. Hip Evaluation
  2. Elbow Evaluation
  3. Ophthalmologist Evaluation
  4. Cardiac Exam
  5. Thyroid Evaluation

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