AKC Standard Guidelines
VIII. Color. Include under this heading the color and markings of the coat (and the skin under the coat if skin color description is to be included). In breeds where multiple colors or color combinations are acceptable, but not all colors are permitted, the complete list of all acceptable colors and color combinations must be included in the standard. In such cases, any color or color combination not mentioned are unacceptable, and judges are to pass judgment on this basis. Color of eyes, eye rims, mouth, lips, nose, nails, etc., are to be given under their respective headings.