Bullmastiff
Giant breed · England
Bullmastiffs are massive, powerful guard dogs known as the 'Gamekeeper's Night Dog.' Bred by crossing Mastiffs with Bulldogs, they are fearless protectors that rarely bark, preferring to use their sheer size to block intruders.
Breed Statistics
- 7–9 yrs
- Lifespan
- 45–59 kg
- Weight
- 45 min/day
- Exercise
- Low maintenance
- Grooming
Temperament
- Reliable
- Devoted
- Alert
- Docile
- Loyal
Daily Calorie Range
1500–2200 kcal/day
For an average adult Bullmastiff. Adjust for weight, age, and activity level.
5 Facts About the Bullmastiff
- 1
Bullmastiffs were created by English gamekeepers in the 19th century by crossing Mastiffs (60%) and Bulldogs (40%) to apprehend poachers.
- 2
They were known as the 'Gamekeeper's Night Dog' and trained to track, knock down, and pin — but not bite — poachers.
- 3
Despite their size, Bullmastiffs rarely bark, relying on their imposing presence as their primary deterrent.
- 4
They mature slowly and may not reach their full physical and emotional adult size until 2–3 years of age.
- 5
Bullmastiffs have an extraordinary sense of smell and can track a scent across varied terrain.
Bullmastiff Age Calculator
Affects aging rate — giants age fastest.