Voluminous, angular, broad, rather short, trapezoid when viewed from above and in front [trapezoid means a four sided object with NO two sides parallel]. See the diagram of the head, and, viewed from the front, it will be noted that the top and bottom surfaces are parallel whilst the two sides are not, being wider at the top than at the bottom].
Cranial Region [Skull]:
In the male, the perimeter [circumference] of the skull measured at the level of its greatest width corresponds roughly to the height at the withers.
In bitches, it may be slightly less.
Its volume and shape are the consequences of the very important development of the temporals [bones of the temple], supra-orbital arches [ over the eye sockets or eyebrows], zygomatic arches [bony ridges forming the lower edges of the eye sockets] and the spacing of the branches of the lower jaw. The upper region of the skull is slightly convex [arched] from one side to the other.
Fronto-nasal or stop is very pronounced, almost forming a right angle with the muzzle (95 to 100 degrees).
The frontal groove is deep, diminishing towards the posterior end of the head. The forehead dominates the face, however it is still wider than high.
The head is furrowed with symmetrical wrinkles, each side of the median groove. These deep ropes of wrinkle are mobile depending on whether the dog is attentive or not.
Facial Region - Muzzle:
Nose: Broad, well opened nostrils, well pigmented according to the mask. Upturned nose (snubbed) permissible but not if it is set back towards the face.
Muzzle: Powerful, broad, thick, but not fleshy below the eyes, rather short, upper profile very slightly concave, with moderately obvious folds. Its width hardly decreasing towards the tip of the muzzle, when viewed from above it has the general shape of a square. In relation to the upper region of the skull, the line of the muzzle forms a very obtuse [blunt] angle upwards. When the head is held horizontally, the tip of the muzzle, truncated, thick and broad at the base, is in front of a vertical tangent to the anterior face of the nose [the end of the muzzle is in front of the forward edge of the nose] Its perimeter [circumference] is almost two thirds of that of the head. Its length varies between one third and one quarter of the total length of the head, from the nose to the occipital crest. The limits stated (maximum one third and minimum one quarter of the total length of the head) are permissible but not sought after, the ideal length of the muzzle being between these two extremes.
Jaws: Very powerful, broad. The lower jaw curves upwards. The chin is well marked and must neither overlap the upper lip exaggeratedly nor be covered by it.
Upper lip: Thick, moderately pendulous, retractile. When viewed in profile it shows a rounded lower line. It covers the lower jaw on the sides. In front, the edge of the upper lip is in contact with the lower lip, then drops on either side, thus forming a reversed, wide V.
Cheeks: Prominent, due to the very strong development of the muscles.