Bullmastiff

Typically only 7-9 years, short even for a giant breed. The dominant reason is a high cancer rate — osteosarcoma, lymphoma, hemangiosarcoma, and mast cell tumors are all common — compounded by bloat and joint disease in this heavy frame. Prospective owners should go in clear-eyed: this is a relatively brief commitment with significant likely veterinary costs. Buying from health-screened lines, keeping the dog lean, and acting fast on lumps or lameness maximize the time you get.

Yes for the right family — they are calm, deeply devoted, naturally protective, and typically gentle and patient with children they are raised with, and they are lower-energy than most large breeds. The serious caveats: their size means an excited or untrained dog can knock over a child, they can be same-sex dog-aggressive and wary of strangers, and they must be trained and socialized while still a controllable puppy. Best for experienced owners, not first-timers.

Moderate — roughly two 20-30 minute walks plus light play daily for an adult; this is not a high-stamina breed and adults are largely couch companions. Two hard rules: protect growing puppies' joints by avoiding stairs, slick floors, and forced exercise until about 18 months, and never exercise a Bullmastiff hard in heat — the flat-ish face causes rapid, dangerous overheating. Exercise in the cool of the day with shade and water.

They are not indiscriminately aggressive — the breed standard is calm and confident — but they are powerful natural guardians that can be wary of strangers and aggressive toward same-sex dogs, and a 120-pound dog acting on instinct is inherently high-stakes. The deciding factor is early, broad socialization and obedience training while the dog is a small puppy. A trained, socialized Bullmastiff is steady and safe; an untrained one is genuinely difficult to manage.

Yes — they drool (keep towels handy), snore, can be flatulent, shed moderately year-round despite the short coat, and have deep facial folds that need cleaning and drying to prevent skin infection. They are also heat-intolerant and need climate control in hot weather. None of this is a dealbreaker for prepared owners, but house-proud buyers and those without summer air conditioning should weigh these realities before committing.

Ask for OFA hip and elbow clearances on both parents, a cardiac evaluation by a veterinary cardiologist (for subaortic stenosis), eye examination results, and thyroid testing. Also ask about longevity and causes of death in their lines, given the breed's cancer burden. There is no DNA test that removes the cancer risk, so line health history and screened parents are the best available signal — a breeder who cannot provide these is one to avoid.