Extra Large breedworking group

Bullmastiff

Bullmastiffs are the gentle giants of the working group — affectionate, deeply loyal, and surprisingly mellow once they've had their exercise. At home, they tend to be calm, easygoing companions who love being near their people, often leaning against you for a cuddle despite their size. Their protective instincts are strong but rarely over-the-top; they're more likely to quietly assess strangers than bark wildly. With family, they're sweet, patient, and famously good-natured.

Bullmastiff — Breed Header
Temperament
affectionate · loyal · calm · protective · gentle · confident
Size
Typically 100–130 lbs and 24–27 inches at the shoulder.
Best for
families
Energy level
medium
Shedding
Yes
Grooming
Low
Training
Moderate
Lifespan
8–10 years

Behavior & traits

  • devoted to family
  • gentle with kids
  • natural guardian
  • calm indoors
  • quietly confident

Health concerns

Like many giant breeds, Bullmastiffs are prone to hip and elbow dysplasia, bloat (gastric torsion), and certain heart conditions like subaortic stenosis. They can also be susceptible to certain cancers and have a shorter lifespan than smaller breeds. Regular vet checkups, weight management, and feeding from a raised, slow-feed bowl can help reduce risks.

Responsible breeding and regular check-ups go a long way. Always ask breeders about health testing.

Feeding & nutrition

Feed a high-quality large-breed formula designed to support joint health and controlled growth, especially during puppyhood. Most adult Bullmastiffs eat 4–6 cups of food per day split into two meals to reduce bloat risk. Avoid heavy exercise right after meals and keep an eye on portions — these dogs can pack on weight easily, which strains their joints.

Exercise needs

Bullmastiffs are surprisingly low-key for their size, needing about 30–45 minutes of moderate exercise daily — think a couple of relaxed walks and some backyard playtime. They're not built for long runs or intense heat, so families should aim for cooler parts of the day. A securely fenced yard and gentle activities like sniff walks or short training games keep them happy without overdoing it.

Living with a Bullmastiff

Living with a Bullmastiff is like sharing your home with a 120-pound shadow who thinks they're a lap dog. They follow their people from room to room, snore loudly on the couch, and have a knack for dramatic sighs when you get up. Expect some drool — especially after drinking or eating — and a bit of shedding year-round, so keep towels handy and a vacuum nearby. They're calm and quiet indoors, which surprises many first-time owners, but they're also strong and need consistent boundaries from puppyhood so their size never becomes a problem. Families often say their Bullmastiff becomes the heart of the household — endlessly devoted, gentle with the kids, and quietly watchful over everyone they love.

Recommended products

A heavy-duty orthopedic dog bed is essential to support their joints and giant frame, along with a raised, slow-feeder bowl to reduce bloat risk and ease eating. Invest in a sturdy no-pull harness and a strong leash since even a well-trained Bullmastiff can outmuscle you if startled. Keep drool towels in every room, and stock up on durable chew toys (like rubber Kong-style or tough nylon bones) made for powerful jaws. A good de-shedding brush used weekly will help keep loose hair under control.