The English mastiff is a huge dog with a square type appearance. They are classified as a working dog. They are a huge breed all the way around. Their legs tend to be spread apart, much like a bulldog. The average male weighs about 160-230 pounds. Then the average female is about 140-190 pounds. The average height of this breed is about 30 inches to the shoulder for males and 27 1/2 for females.