Tail-Set: How the base of the tail is set on the rump.

Tapetum Lucidum: The highly reflective portion of the interior of the canine eyeball that aids in night vision.

Tattoo: A method of on-dog identification.

Tawny: Used, along with white, to describe Ibizan Hounds, this color is the color of lions (sandy yellow). Also referred to as Lion Tawny. Color definitions may vary by breed. Always check the breed standard for the definitive color description.

Teat: The nipple of an animal

Terrier Front: Straight front as found on fox terriers.

Terrier Group: A group of dogs used originally for hunting vermin.

Testicles: The male gonads, which produce spermatoza. AKC regulations specify that a male that does not have two normal testicles normally located in the scrotum may not compete at any show and will be disqualified, except that a castrated male may be entered in obedience trials, tracking tests, field trials (except Beagles), as a stud dog in a Stud Dog class, and Veterans class at an independent specialty.

Testosterone: A potent androgenic hormone produced chiefly by the testes; responsible for the development of male secondary sex characteristics.

Thigh: The hindquarter from hip to stifle.

Thoracic Vertebrae: The thirteen vertebrae of the chest with which thirteen pairs of ribs articulate.

Throatiness: An excess of loose skin under the throat.

Thumb Marks: Black spots on the region of the pastern.