стандарт кане корсо (выдержка) ФЦИ
английский
FACIAL REGION :
Nose : Black and large with ample, open nostrils, on the same line as the nasal bridge.
Muzzle : Noticeably shorter than the skull (ratio muzzle : skull approximately 1 : 2). Strong, square; the front part of the muzzle is flat; the lateral surfaces are parallel; the muzzle is as wide as long. The profile of the nasal bridge is straight.
Lips : The upper lips hang moderately and cover the mandible, so that the lower profile of the muzzle is determined by the lips. Jaws/Teeth : Jaws very large, thick and curved. Slightly undershot. Level bite acceptable, but not sought after.
Eyes : Medium-sized, ovoid, looking directly forward, slightly protruding. Eyelids close fitting. Colour of iris as dark as possible, depending from the colour of the coat. Expression keen and attentive.
Ears : Triangular, drooping, with a wide set on high above the zygomatic arches. Often cropped in the shape of an equilateral triangle.
NECK : Strong, muscular, as long as the head.
BODY : The body is somewhat longer than the height at the withers. Sturdily built, but not squat.
перевод
Губы: верхние губы умеренно повислые и покрывают нижнюю челюсть таким образом, что нижний профиль морды определяется губами. Челюсти / Зубы: Челюсти очень крупные, толстые и изогнутые. Слегка перекус. Прямой прикус приемлем, но не желателен.
Действительно , пошла глянула на сайте FCI, CI-Standard N° 343 / 06. 06. 2007/ ни какого упоминания про 0.5 см там нет
Значит все остается на усмотрение эксперта...