Bullmastiff — breed guide

At a glance

Group

working

Size

Giant

Weight

45–59 kg (99–130 lb)

Life span

7–9 years

Coat

Short and dense

Living with a Bullmastiff

• Low energy — happy with gentle daily exercise.
• Almost no grooming.
• Moderate shedding.
• Trainable with consistency.
• Very quiet.
• Good with children.
• Not always easy with other dogs — introduce carefully.
• Typically lives happily with a cat.
• Not well suited to a flat — space, exercise need or voice works against it.
• Better with previous experience behind you.
• Struggles in heat — walk early, walk late, and watch for distress.
• Average cold tolerance.
• Flat-faced (brachycephalic): breathing is harder in heat and under exertion, so walk weather matters more for this breed than most.

Temperament

Calm · Devoted · Fearless · Steady

Health to watch

• Hip dysplasia
• Bloat
• Lymphoma
• Brachycephalic airway signs

Owner-logged information shared via Leash Life is not veterinary advice; ask your vet about screening for these.

Questions people ask

Is a Bullmastiff good with kids?

Generally yes. Bullmastiffs are usually good with children when raised with them and given their own quiet space.

Is a Bullmastiff good with cats?

Usually yes. Bullmastiffs typically settle well with a resident cat — introduce them slowly and give the cat a high perch and a way out of the room.

How much exercise does a Bullmastiff need?

A gentle daily walk.

Can a Bullmastiff handle hot weather?

Carefully. Flat-faced breeds overheat fast — early or late walks only on hot days. It struggles; keep summer outings short and shaded.