Taken Up
A horse pulled up sharply by its rider because of being in close quarters.  

Takeout
Commission deducted from mutuel pools which is shared by the track, horsemen (in the form of purses) and local and state governing bodies in the form of tax.

Tattoo
A permanent, indelible mark on the inside of the upper lip used to identify the horse.  

Teletheater
Special facility for showing simulcast races.  

Thoroughbred
A Thoroughbred is a horse whose parentage traces back to any of the three "founding sires" the Darley Arabian, Byerly Turk and Godolphin Barb, and who has satisfied the rules and requirements of The Jockey Club and is registered in "The American Stud Book" or in a foreign stud book recognized by The Jockey Club and the International Stud Book Committee. Any other horse, no matter what its parentage, is not considered a Thoroughbred for racing and/or breeding purposes.  

Tight
Ready to race.  

Tightener
1) A race used to give a horse a level of fitness that cannot be obtained through morning exercises alone.  

Toe-in
A conformation flaw in which the front of the foot faces in and looks pigeon-toed, often causing the leg to swing outward during locomotion ("paddling").  

Toe-out
A conformation flaw in which the front of the foot faces out, often causing the leg to swing inward during locomotion ("winging").  

Track Bias
A racing surface that favors a particular running style or position. For example, a track bias can favor either front- runners or closers or horses running on the inside or outside.