Semi-dominant lethal, variable expression.
Considerable variation occurs among individuals in the extent of unpigmented pelage.
There is extensive white on the face, ears and forehead. The tail is largely unpigmented in most individuals, and invariably is white at the tip. In the unpigmented areas the individual hairs are white throughout. The mid-dorsum is nearly always pigmented, but not clearly delineated. The margins of the pigmented areas appear ragged and uneven.