The Bullmastiff is massive, very powerfully built, but is not a cumbersome dog. The large, broad skull is wrinkled and the muzzle is broad, deep and usually darker in color. The forehead is flat and the stop is moderate. The black nose is wide and has large nostrils. The teeth meet in a level or undershot bite. The medium sized eyes are dark hazel. The V-shaped ears are set high and wide, carried close to the cheeks, giving a square appearance to the skull.
The strong tail is set high, thicker at the root and tapering and is either straight or curved, and reaches to the hocks. The back is short, straight and level between the withers and the loin. The short, dense, slightly rough coat comes in brindle, fawn, or red, often with black markings on the head. Data Courtesy : www. dogbreedinfo . com