Scent: The odor left by an animal or bird on the trail (ground-scent) or wafted through the air (air-borne scent).

Scent Hound: A breed of hunting dog that tracks animals by smell.

Schipperke: A small stocky dog of a breed developed in Belgium, having dense long black fur and small pointed ears.

Scissors Bite: A bite in which the outer side of the lower incisors touches the inner side of the upper incisors.

Sclera: The tough white fibrous outer envelope of tissue covering all of the eyeball except the cornea.

Screw Tail: A naturally short tail twisted in more or less spiral formation