The Collaborative International Dictionary of English v.0.48:

Canine \Ca*nine"\, a. [L. caninus, fr. canis dog: cf. F. canin.
   See Hound.]
   1. Of or pertaining to the family Canid[ae], or dogs and
      wolves; having the nature or qualities of a dog; like that
      or those of a dog.
      [1913 Webster]

   2. (Anat.) Of or pertaining to the pointed tooth on each side
      the incisors.
      [1913 Webster]

   Canine appetite, a morbidly voracious appetite; bulimia.

   Canine letter, the letter r. See R.

   Canine madness, hydrophobia.

   Canine tooth, a tooth situated between the incisor and
      bicuspid teeth, so called because well developed in dogs;
      usually, the third tooth from the front on each side of
      each jaw; an eyetooth, or the corresponding tooth in the
      lower jaw.
      [1913 Webster]

WordNet (r) 3.0 (2006):

canine tooth
    n 1: one of the four pointed conical teeth (two in each jaw)
         located between the incisors and the premolars [syn:
         canine, canine tooth, eyetooth, eye tooth,
         dogtooth, cuspid]