MOUTH AND MUZZLE - THE PREFERRED BITE IS EITHER LEVEL -OR SLIGHTLY UNDERSHOT. MUZZLE OF MEDIUM LENGTH; A SQUARE MUZZLE IS OBJECTIONABLE.
The muzzle is of medium length, bearing in mind the desired one to two ratio (1:2) of muzzle to skull. The muzzle is neither turned up, nor down-faced; in other words, the planes are parallel when viewed in profile. The top of the muzzle is on a line with or slightly below the bottom of the eye; it should be blunt but never square. The underjaw should be strong and visible from a frontal view, without any indication of snipiness; accordingly, the shape of the muzzle and prominence of lower jaw contribute to the proper expression.
The preferred bite is either level or slightly undershot. A scissors bite, while not desirable, is not a serious fault. An undershot bite with canines visible when the mouth is closed is not desirable. Adequate width of the lowerjaw, with a full compliment of incisors, contributes to proper expression.