_I1–3_, Incisors; _C_, canine; _P1–4_, premolars; _M1–2_, molars. Note
the crowding of the canines and premolars on account of the
shortness of the jaw.
]
The =canine teeth= are large, conical, and curved. The upper canine is
separated from the corner incisor by an interval into which the lower
canine is received when the jaws are closed.[115] The lower canine is
close to the corner incisor. The root is about an inch (ca. 2 to 3 cm.)
long and is flattened laterally.
The =cheek teeth= are typically ⁶⁄₇, but in brachycephalic breeds they
are commonly reduced to ⁵⁄₇, and in extreme cases even to ⅘. The
reduction occurs at either end or at both ends of the series.[116] The
first tooth appears only once. The fourth tooth of the upper row and the
fifth of the lower row are much larger than the rest, and termed
=sectorial= or =carnassial= teeth. From these the teeth diminish in size
both forward and backward. The upper and lower teeth do not correspond,
but rather dovetail. The teeth behind the sectorial ones are
tuberculate, _i. e._, have rounded eminences on the masticatory surface.
The others are all sectorial in character, _i. e._, have sharp-edged,
pointed projections, the middle one being the most prominent. The
premolars are laterally compressed, and are separated by intervals from
the canines and from each other, except in the brachycephalic breeds.
The upper molars have wide, somewhat quadrangular crowns, and three
roots. The crown of the upper fourth premolar (Dens sectorius) is
divided into two pointed lobes and has an antero-internal tubercle; it
has three roots. The crown of the first lower molar (Dens sectorius) is
compressed laterally and has two pointed, sharp-edged lobes, behind
which are one or two tubercles; it has two roots.
[Illustration: