The inclination backward of the nose allows a free passage of the air into the nostrils whilst the dog is holding his quarry.  It is apparent that if the mouth did not project beyond the nose, the nostrils would be flat against the part to which the dog was fixed, and breathing would then be stopped.

The upper lip, called the “chop,” or flews, should be thick, broad, pendant and very deep, hanging completely over the lower jaw at the sides, but only just joining the under lip in front, yet covering the teeth completely.  The amount of “cushion” which a dog may have is dependent upon the thickness of the flews.  The lips should not be pendulous.

The upper jaw should be broad, massive, and square, the tusks being wide apart, whilst the lower jaw, being turned upwards, should project in front of the upper.  The teeth should be large and strong, and the six small teeth between the tusks should be in an even row.  The upper jaw cannot be too broad between the tusks.  If the upper and lower jaws are level, and the muzzle is not turned upwards the dog is said to be “down-faced,” whilst if the underjaw is not undershot he is said to be “froggy.”  A “wry-faced” dog is one having the lower jaw twisted, and this deformity so detracts from the general appearance of the dog as seriously to handicap him in the show-ring.

The underjaw projects beyond the upper in order to allow the dog, when running directly to the front, to grasp the bull, and, when fixed, to give him a firmer hold.  The eyes, seen from the front, should be situated low down in the skull, as far from the ears, the nose, and each other as possible, but quite in front of the forehead, so long as their corners are in a straight line at right angles with the stop, and in front of the forehead.  They should be a little above the level of the base of the nasal bone, and should be quite round in shape, of moderate size, neither sunken nor prominent, and be as black in colour as possible—­almost, if not quite, black, showing no white when looking directly to the front.

A good deal of a Bulldog’s appearance depends on the quality, shape, and carriage of his ears.  They should be small and thin, and set high on the head; that is, the front inner edge of each ear should, as viewed from the front, join the outline of the skull at the top corner of such outline, so as to place them as wide apart, as high, and as far from the eyes as possible.  The shape should be that which is known as “rose,” in which the ear folds inward at the back, the upper or front edge curving over outwards and backwards, showing part of the inside of the burr.  If the ears are placed low on the skull they give an appleheaded appearance to the dog.  If the ear falls in front, hiding the interior, as is the case with a Fox-terrier, it is said to “button,” and this type is highly objectionable.  Unfortunately, within the last few years the “button” and “semi-tulip” ear have been rather prevalent amongst the specimens on the show bench.