Bull Mastiff is large sized dog breeds originating from the United Kingdom. They are used as working dogs and guard dogs. They grow as tall as 27 inches and weigh as much as 100-133 pounds. Its gait is powerful and effortless. Its coat is smooth and short with a glossy texture occurring in red, brindle and fawn color. They are known for their calm and composed nature. They are even tempered and sensitive. It is extremely faithful towards Its family and gets along well with other dog breeds and pets. They are reserved, with strangers.