Dogue de Bordeaux dogs, or French Mastiff, have a large, muscular build with a broad head, strong jaws, and a thick neck. They have a powerful appearance that commands attention. Due to their brachycephalic (short-nosed) facial structure, Dogue de Bordeaux dogs are sensitive to heat and may be prone to overheating. It’s important to provide them with plenty of shade and water, especially during hot weather.