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American Bulldog vs Bullmastiff

Side-by-side comparison of two popular breeds — temperament, exercise, grooming, lifespan and common health issues. Use it to decide which breed fits your home.

American Bulldog vs Bullmastiff — at a glance

The American Bulldog (27–55 kg, 10–12 years) and the Bullmastiff (45–59 kg, 7–9 years) sit in different — or sometimes overlapping — corners of dog ownership. Here's how they really compare for an everyday Irish or UK family.

American Bulldog is the significantly higher-energy dog of the two. If you can't commit to 60+ minutes of active exercise daily plus mental stimulation, the Bullmastiff is the lower-friction choice.

Insurance premiums for breeds with brachycephalic, joint or cancer predispositions run 20–40% above average — check before you commit. We have a free quote calculator here.

American Bulldog Bullmastiff
Group Working Working
Origin United States England
Weight 27–55 kg 45–59 kg
Height 51–71 cm 61–69 cm
Lifespan 10–12 years 7–9 years
Energy level
Trainability
Grooming needs
Good with kids
Good with other pets
Hypoallergenic
Watchdog instinct
Novice-owner OK

American Bulldog

Temperament

Confident, courageous, devoted. Protective of family without being aggressive when properly socialised. Excellent with children when raised together.

Exercise

60+ minutes daily of vigorous exercise. Strong, athletic, capable of weight-pulling + agility.

Grooming

Short coat — weekly brush. Light shedding year-round.

Health

Generally healthier than English Bulldog. Watch for: hip + elbow dysplasia, neuronal ceroid lipofuscinosis (NCL, DNA test), ichthyosis, allergies.

Full American Bulldog profile →

Bullmastiff

Temperament

Calm, devoted, courageous, naturally protective.

Exercise

30–45 minutes daily.

Grooming

Short coat, weekly brush. Drool requires towels.

Health

Hip dysplasia. Bloat / GDV. Cardiomyopathy. Cancer (over-represented). Lifespan tragically short — 7–9 years.

Full Bullmastiff profile →

Which is right for you?

Pick the American Bulldog if

Active families with garden, owners experienced with large working breeds.

Pick the Bullmastiff if

Experienced owners, families with older children, secure homes.

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