The coat may be trimmed slightly only to accent the body line. Over trimming which alters the natural rugged appearance is to be avoided. A coat too long or too short is a fault, as is a silky or woolly coat. It is tousled without being curly. On the skull, it is short, and on the upper part of the back, it is particularly close and harsh always, however, remaining rough.
Ears are rough-coated.
Undercoat a dense mass of fine, close hair, thicker in winter. Together with the topcoat, it will form a water-resistant covering. A flat coat, denoting lack of undercoat is a serious fault. Mustache and beard very thick, with the hair being shorter and rougher on the upper side of the muzzle. The upper lip with its heavy mustache and the chin with its heavy and rough beard gives that gruff expression so characteristic of the breed.