🐕‍🦺 X-Large · United Kingdom (England)

Bullmastiff: Size, Weight & Temperament

A powerful, calm guard and protection dog with a strong protective instinct, requiring clear leadership and close veterinary care due to health risks.

! Experienced only
Bullmastiff dog breed portrait
Photo: Wikimedia Commons · CC BY-SA 3.0 · Wikimedia Commons
Weight male50–59 kg
Weight female45–54 kg
Shoulder height61–68 cm
Size classX-Large (over 45 kg)
Fully grownat approx. 24 months
Life expectancy8–10 years
Activity levelModerate
OriginUnited Kingdom (England)
ClassificationFCI Group 2 (Molossoid Breeds, Section 2.1 Mastiff-type)
Temperament & character

The Bullmastiff is calm, confident, and very affectionate with his family, while reserved to watchful toward strangers. His pronounced protective instinct calls for early, consistent socialization.

Exercise & stimulation

Exercise needs are moderate; long but not overly strenuous walks are sufficient, and excessive joint strain during growth should be avoided. Exertion in heat is poorly tolerated because of the massive build.

Grooming

The short coat is low-maintenance and needs only occasional brushing. Facial skin folds should be checked regularly and kept dry, as should the ears.

Suitable for beginners?

Not particularly suited for beginners, since the size, protective drive, and health risks call for experienced, physically confident owners. Consistent training from puppyhood is essential.

Health & common problems

Mastiff-type breeds like the Bullmastiff are prone to hip dysplasia, gastric torsion, and cancers; life expectancy is comparatively low. Regular checkups and feeding management to help prevent gastric torsion are recommended.

Good with: Experienced owners with house and garden

Is your Bullmastiff at a healthy weight? Calculate the ideal weight and the right portion size for free in the Souldog app.

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This information is for general guidance and does not replace veterinary or breeder advice. Temperament and health vary individually within every breed.