a Canine teeth usually appear only in male horses; the canine teeth are usually regressed or absent in mares.
b Small premolars (wolf teeth) are often present, especially in the upper jaw but may be present in the mandible and may be unilateral or bilateral.
c The canine tooth of domestic ruminants has commonly been counted as a fourth incisor.
d The maxillary second premolar and maxillary and first molar can be absent in some cats.
Dc = Deciduous canine. Di = Deciduous incisor. Dp = Deciduous premolar. C = Canine. I = Incisor. M = Molar. P = premolar.