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Bullmastiff
Working breed from England
Breed overview
Reviewed · Database recordAbout the Bullmastiff
The Bullmastiff is a giant, short-coated breed from England, classified in the Working group. Its temperament is described as loyal, protective, calm, courageous, affectionate, and confident. However, individual dogs may vary. The breed has a moderate energy level (3 out of 5) and is fairly trainable (4 out of 5). Grooming needs are low (2 out of 5), with moderate shedding (3 out of 5). Bullmastiffs are generally suitable with children (4 out of 5) but may be less compatible with other dogs (3 out of 5). They are not ideal for apartment living (2 out of 5). Estimated adult weight ranges from 50 to 59 kg for both sexes, and height from 64 to 69 cm. Estimated lifespan is 7 to 9 years. Recognition status varies by registry.
Quick facts
Bullmastiff at a glance
Sizegiant
Breed groupWorking
OriginEngland
Lifespan7–9 years
Male weight50–59 kilogram
Female weight50–59 kilogram
Male height64–69 centimetre
Female height64–69 centimetre
Origin and history
Where the breed comes from
The Bullmastiff was developed in mid-19th century England by gamekeepers. They crossed the English Mastiff with the Old English Bulldog to create an effective estate guard dog for tracking poachers. This history is based on available sources, though specific dates and details may be uncertain. Originally bred to guard estates, the Bullmastiff was known as 'The Gamekeeper's Night-Dog'. Its origins are in England, and it belongs to the Working breed group. The breed's development reflects a need for a powerful, reliable guardian, but the exact timeline and methods are not fully documented in the supplied facts.
Physical characteristics
Structured dataSize, build and coat
Female
50–59 kilogramAdult weight64–69 centimetreAdult heightCoat typesShortCoat colorsPendingRecognitionvaries by registryData methodai assisted draft
Temperament
Typical breed tendencies
Loyalprotectivecalmcourageousaffectionateconfident
Breed tendencies are general guidance. Individual behavior depends on genetics, socialization, training, health and environment.
Exercise, training and maintenance
1–5 methodologyDaily care profile
Moderate compared with other breeds
Typically responsive to training
Lower coat-maintenance demand
Moderate compared with other breeds
Family suitability
Home and household fit
Supervise every dog–child interaction.
Introductions and socialization still matter.
Exercise, enrichment and noise tolerance affect fit.
Climate suitability
Modelled tendency · low confidence
Modelled tendency · low confidence
Modelled tendency · low confidence
A general morphology-based tendency. Individual dogs still require shade, shelter, water, acclimation and weather-appropriate activity. Method: climate-morphology-v1.
Health overview
Veterinary sources requiredHealth considerations
No Bullmastiff-specific screening programme or peer-reviewed disorder-prevalence study is currently attached to this profile. This is not evidence that the breed has no health risks. Owners should use routine preventive veterinary care and discuss screening appropriate to the individual dog's history, examination and family line.
Veterinary disclaimer: This profile is educational and does not replace examination, diagnosis or treatment by a veterinarian.
Feeding overview
Nutrition and feeding
Research in progress
Reviewed feeding guidance will appear after an approved source is imported and editorially reviewed.
Decision support
Potential advantages and challenges
Potential advantages
- Typically responsive to consistent training.Supported by trainabilityScore: 4
- Can be a strong family match when socialized and supervised.Supported by childSuitability: 4
- Commonly described as loyal.Supported by temperaments.loyal: true
Potential challenges
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Growth chart
Bullmastiff puppy growth
Modeled estimates
Open interactive chart From puppy weight to adult size
Compare male and female growth, check weight by age and estimate mature size.
Adult male weight50–59 kilogramAdult female weight50–59 kilogramGrowth modeladult-range-size-model-v1
Preview only. Open the complete chart to adjust age, current weight and measurement units.
Frequently asked questions
Common questions
What is the size and lifespan of a Bullmastiff?
Bullmastiffs are a giant breed. Estimated adult weight for both males and females is 50 to 59 kg, and height is 64 to 69 cm. Estimated lifespan is 7 to 9 years. These are modelled estimates and may vary.
What is the Bullmastiff's temperament like?
The breed is described as loyal, protective, calm, courageous, affectionate, and confident. However, individual dogs may not exhibit all these traits. They are generally suitable with children (score 4 out of 5) but may be less compatible with other dogs (score 3 out of 5).
How much exercise does a Bullmastiff need?
Bullmastiffs have a moderate energy level (score 3 out of 5). They require regular exercise but are not excessively active. Specific exercise needs are not detailed in the supplied facts.
What are the grooming requirements for a Bullmastiff?
Grooming needs are low (score 2 out of 5) due to their short coat. They shed moderately (score 3 out of 5). Regular brushing can help manage shedding.
Is a Bullmastiff suitable for apartment living?
Bullmastiffs are not ideal for apartments (score 2 out of 5). They are a giant breed and likely need space, though specific living requirements are not provided.
Where did the Bullmastiff originate?
The Bullmastiff originated in England. It was developed in the mid-19th century by gamekeepers crossing English Mastiff with Old English Bulldog to guard estates and track poachers.
Is the Bullmastiff recognized by major kennel clubs?
Recognition status varies by registry. The supplied facts do not specify which registries recognize the breed.
Data transparency
✓ Published · VerifiedSources and review status
APIThe Dog API ↗The Dog API Terms of Service (effective 2023-07-01)
VETERINARY SOURCEWSAVA Global Nutrition Guidelines and Toolkit ↗Copyright; factual citation and original summary only
Image source: The Dog API. Last reviewed 7/20/2026.