canine (n.)

late 14c., "a pointed tooth," from Latin caninus "of the dog," genitive of canis "dog" (source of Italian cane, French chien), from PIE root *kwon- "dog." The meaning "a dog" is first recorded 1869.

canine (adj.)

c. 1600, "pertaining to one of the four sharp-pointed tearing teeth between the incisors and the molars," from canine (n.) or Latin caninus. The meaning "pertaining to a dog or dogs" is from 1620s.