The jaw is undershot and powerful. The Dogue should always have a black or red mask that can be distinguished from the rest of the coat around and under the nose, including the lips and eye rims. The nose color in red-masked dogs should be brown, in black-masked dogs, it must be black. The muzzle should be at most a third of the total length of the head and no shorter than a quarter of the length of the head, the ideal being between the two extremes. The upper lip hangs thickly down over the lower jaw.