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 brachycephalic head shape can also encourage ectropion—an outward rolling of the lower eyelid— which can lead to conjunctivitis (eye inflammation) and bacterial infections.