The Bullmastiff is a large and strong dog. They can weigh from 100 to 130 pounds and grow to about 24 to 27 inches high. The Bullmastiff despite it size is a quiet and friendly dog. It is patient and gentle with family and people they know. However, it can be protective of family and friends when approached by strangers.

The bullmastiff does well with family and can adapt to different living situations. Because of it's size, it is too big for an apartment.