Claiming Race
A race in which each horse entered is eligible to be purchased at a set price. Claims must be made before the race and only by licensed owners or their agents who have a horse registered to race at that meeting or who have received a claim certificate from the stewards.  

Clocker
One who times workouts and races.  

Closer
A horse that runs best in the latter part of the race, coming from off the pace.  

Clubhouse Turn
Generally, the turn on a racing oval that is closest to the clubhouse facility; usually the first turn after the finish line.  

Colic
Abdominal pain caused by a problem in a horse's digestive system.

Colors (horse)
Colors accepted by The Jockey Club are bay, black, chestnut, dark bay or brown, gray, roan and white. 

Colt
An ungelded (entire) male horse four-years-old or younger.  

Condition Sheet
Issued by a racing secretary and sets forth conditions of races to be run for the coming week. 

Conditioner
1) A trainer. 2) A workout or race to enable a horse to attain fitness.  

Conditions
The requirements of a particular race. This may include age, sex, money or races won, weight carried and the distance of the race.