Bullmastiff
Updated November 30, 2025
The Bullmastiff is a large, fearless guardian with a calm demeanor, originally bred to protect estates. Despite their powerful build, they are affectionate and devoted companions.
Protective, Loyal, Courageous, Reserved, Affectionate
100-130 pounds
24-27 inches
7-9 years
Fawn, Red, Brindle
At a Glance
Good with Kids
Jump to Section
About Bullmastiff
The Bullmastiff is a large, fearless guardian with a calm demeanor, originally bred to protect estates. Despite their powerful build, they are affectionate and devoted companions.
What Makes Bullmastiffs Special
Bullmastiffs are calm, courageous, and fiercely loyal.
They are gentle giants with their families and vigilant watchdogs with natural protective instincts.
With the right training and environment, they are deeply affectionate companions.
Bullmastiff History & Origin
Bullmastiffs were developed in England during the 19th century by crossing Bulldogs with Mastiffs to create a powerful yet controllable guard dog.
Bred to guard estates and catch poachers without mauling them.
A cross between 60% Mastiff and 40% Bulldog.
Recognized by the AKC in 1934.
Known as the 'Gamekeeper's Night Dog' for their silent guarding ability.
Modern Bullmastiffs are beloved family protectors and companions.
Bullmastiff Characteristics
Dogs are individuals and not all dogs, even those of the same breed, will exhibit all the same qualities.
Care Requirements
Exercise Needs
Grooming Needs
Training Needs
Health Issues
Shedding Level
Bullmastiff Appearance
Bullmastiffs are large, muscular dogs with a powerful, confident appearance.
Their short, dense coat comes in shades of fawn, red, or brindle and their broad head gives them a distinctive look.
Physical Features
Ears
V-shaped and dark-colored, lying close to the cheeks
Eyes
Dark and expressive, set wide apart
Nose
Large and black with wide nostrils
Coat & Build
Coat Length
Short and dense
Coat Color
Fawn, red, or brindle with a black mask
Tail
Thick at base, tapering, and carried straight or curved
Bullmastiff Temperament
Bullmastiffs are fearless and confident protectors who form strong bonds with their family members.
Despite their size, they are gentle and affectionate with people they trust, often forming strong attachments to children.
They are naturally reserved with strangers but are rarely aggressive without cause. Early socialization is essential to ensure stable behavior.
Bullmastiffs respond well to consistent, firm, but gentle training. They are independent thinkers, so patience and positive reinforcement are important.
While they can be stubborn at times, their love for their family and desire to please can shine through with proper guidance.
Temperament Traits
Good With
Health
Bullmastiffs are generally healthy but prone to several large-breed issues, including joint problems and bloat.
Common Health Issues
Preventive Care
Vet checkups, joint supplements, healthy weight maintenance, and early detection of conditions
How to Care for a Bullmastiff
Bullmastiffs are low-maintenance in grooming but require regular training and health monitoring. Their exercise needs are moderate, but their size requires ample living space.
Grooming
Bullmastiffs have short coats that shed moderately. Weekly brushing helps keep their coat healthy.
They are prone to drooling, so facial hygiene and wiping is recommended.
Clean their ears regularly and maintain dental hygiene to prevent common issues.
Training
Begin socialization early to build confidence and prevent overprotectiveness.
Bullmastiffs benefit from obedience training with consistent rules and positive reinforcement.
Short, engaging sessions work best due to their independent nature.
Diet
Feed a large breed formula to support joint health and manage weight.
Monitor for bloat—a serious condition in deep-chested breeds—and avoid feeding immediately before or after vigorous exercise.
Consult your vet to adjust diet based on age, health, and activity.
Exercise
Bullmastiffs need moderate daily activity. A couple of 30-minute walks and some playtime suffice.
Avoid intense exercise during hot weather, as they are heat-sensitive.
Mental stimulation through training and puzzle toys helps manage boredom.
Environment
They do best in homes with space to move but adapt well to calm households.
Not suited for apartments due to size and guarding instincts.
Secure fencing is essential due to their protective nature.
Living Conditions
Space Requirements
Large home with yard preferred
Climate Adaptability
Sensitive to heat; needs cool environment
Apartment Living
Not recommended for apartment living
Best Suited For
Ideal for families or individuals seeking a loyal protector
Training Tips
Frequently Asked Questions
Are Bullmastiffs good family dogs?
Yes, they are loyal and gentle with their family, including children, when properly trained and socialized.
Do Bullmastiffs require a lot of grooming?
No, they are low-maintenance in grooming with short coats, requiring only weekly brushing.
Are Bullmastiffs easy to train?
They are trainable but require consistent and firm training due to their independent nature.
Can Bullmastiffs live in apartments?
They are not well-suited to apartments due to their size and guarding instincts.
Are Bullmastiffs good guard dogs?
Yes, they are natural guardians and highly protective of their family and territory.
Specialized Care Guides
Puppy Care
Start training and socialization early to manage size and instincts
Senior Care
Monitor joints, provide orthopedic bedding, reduce exercise intensity
First-Time Owner Tips
May not be ideal for first-time dog owners due to size and training needs
Looking for a Bullmastiff?
Connect with responsible breeders, rescue organizations, and pet adoption services in your area.