The following is from the Great Dane Standard:
Head
The head shall be rectangular, long, distinguished, expressive, finely chiseled, especially below the eyes. Seen from the side, the Dane's forehead must be sharply set off from the bridge of the nose, (a strongly pronounced stop). The plane of the skull and the plane of the muzzle must be straight and parallel to one another. The skull plane under and to the inner point of the eye must slope without any bony rotuberance in a smooth line to a full square jaw with a deep muzzle (fluttering lips are undesirable). The masculinity of the male is very pronounced in structural appearance of the head. The bitch's head is more delicately formed. Seen from the top, the skull should have parallel sides and the bridge of the nose should be as broad as possible. The cheek muscles should not be prominent. The length from the tip of the nose to the center of the stop should be equal to the length from the center of the stop to the rear of the slightly developed occiput. The head should be angular from all sides and should have flat planes with dimensions in proportion to the size of the Dane. Whiskers may be trimmed or left natural.
Eyes
The eyes shall be medium size, deep set, and dark, with a lively intelligent expression. The eyelids are almond-shaped and relatively tight, with well developed brows. Haws and mongolian eyes are serious faults. In harlequins, the eyes should be dark; light colored eyes, eyes of different colors and walleyes are permitted but not desirable.
Ears
The ears shall be high set, medium in size and of moderate thickness, folded forward close to the cheek. The top line of the folded ear should be level with the skull. If cropped, the ear length is in proportion to the size of the head and the ears are carried uniformly erect.
Nose
The nose shall be black, except in the blue Dane, where it is a dark blue-black. A black spotted nose is permitted on the harlequin; a pink colored nose is not desirable. A split nose is a disqualification.
Teeth
The teeth shall be strong, well developed, clean and with full dentition. The incisors of the lower jaw touch very lightly the bottoms of the inner surface of the upper incisors (scissors bite). An undershot jaw is a very serious fault. Overshot or wry bites are serious faults. Even bites, misaligned or crowded incisors are minor faults.
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