Bullmastiff (gamekeeper night dog)

Weighing 100–130 lb (45.4–59 kg) and standing 24–27 in (61–68.6 cm) tall, the Bullmastiff is a giant representative of the Working Group. AKC registration statistics place it at #67 in popularity. Originally from England, the breed carries that working heritage in its build and temperament. As with most breeds, males occupy the top of the size range.

How long do Bullmastiffs live? Based on published breed data, a typical lifespan is 7–9 years. Lifespan is influenced by size, since smaller dogs generally outlive larger ones, alongside genetics, body weight, dental care and regular veterinary checkups. Keeping a Bullmastiff lean, exercised and current on preventive care is the most practical way to reach the upper end of that range. On the size-related aging curve, giant breeds like this one age at a moderate pace.

Apartments can work with a solid exercise routine, though more space is preferable. Shedding is moderate; expect some hair on furniture, heaviest during seasonal coat changes. Low-maintenance coat: a quick weekly brush and the occasional bath cover it. No low-shedding claim applies here. Allergy sufferers should spend time with the breed before committing.

This is a high-energy breed that needs serious daily activity to stay happy and well-behaved. Eager to please and quick to learn, this breed makes training one of the genuine joys of ownership. Most do fine with respectful children, especially when raised together. Canine housemates generally work out fine, though same-sex pairs can need more management.

Every number on this page is meant to be used, not just read. The calculators below start from this breed's 52.2 kg average weight, which in our 152-breed database sits heavier than 95% of breeds, and turn it into daily food portions, crate sizing and first-year budget estimates. That percentile is not trivia. Food bills, gear sizing and medication dosing all track body weight. Data comes from the AKC breed profile cited below, and breed-specific health risks are exactly why comparing pet insurance early, while your dog is young and healthy, pays off.