About the Bullmastiff
Powerful guardian breed developed by crossing Bulldogs with Mastiffs to create the ideal gamekeeper's night dog. Bred to track and pin poachers without mauling them. Calm but formidable.
Weight Range
100–130
lbs
Size
🐕 Giant Breed
Activity
🛋️ Low Activity
Lifespan
7-9 years
Bullmastiff Temperament & Personality
Swipe to explore personality traits →
Reliable
Consistently dependable in temperament and behavior — you always know what to expect.
Devoted
Unwaveringly loyal to their family — forms deep bonds that last a lifetime.
Alert
Highly aware of their surroundings and quick to notice changes or approaching visitors.
Brave
Courageous and steady under pressure — won't back down when their family needs them.
Docile
Gentle and easy to manage — naturally cooperative and willing to follow guidance.
Bullmastiff Health & Dietary Needs
Common Health Considerations
Breed-Specific Nutritional Guidance
Giant breed needing controlled growth during development. Adults need moderate calories — less than expected for their size due to low activity. Joint-supporting diet essential.
Estimated Daily Calories for Bullmastiffs
Based on a typical 115 lb Bullmastiff with low activity level:
1631
calories per day
* This is an estimate using the RER formula (70 × weight_kg^0.75 × activity multiplier). Use our calculator below for a precise recommendation based on your dog's exact weight, age, and condition.
Complete Bullmastiff Feeding Guide
Expert Tips for Bullmastiffs
Feed 2–3 meals daily to prevent bloat. Use giant-breed puppy food for slow, controlled growth. Avoid excessive exercise during growth — and heavy meals before or after activity.
Practical Feeding Guidelines
Meal Frequency
Feed 2-3 measured meals per day. Avoid single large meals to reduce bloat risk.
Portion Control
Always measure portions with a kitchen scale or measuring cup. Treats should not exceed 10% of daily calories.
Hydration
Ensure fresh water is always available. A Bullmastiff needs approximately 58–115 oz of water daily.
Weight Monitoring
Weigh your Bullmastiff monthly and adjust portions accordingly. Ideal body condition means you can feel (but not see) the ribs.
Get Your Bullmastiff's Exact Calorie Needs
Our free calculator uses veterinarian-approved formulas to give you a personalized feeding recommendation based on your Bullmastiff's exact weight, age, activity level, and body condition.
Calculate Now — It's Free