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