Simulcast
A simultaneous live television transmission of a race to other tracks, off-track betting offices or other outlets for the purpose of wagering. 

Sire
1) The male parent. 2) To beget foals.  

Sitting in the Pocket
When a horse is sitting on the rail behind the pacesetter.

Sloppy (track)
A racing strip that is saturated with water; with standing water visible.  

Snip
Small patch of white hairs on the nose or lips of a horse.  

Sophomores
Three-year-old horses. Called sophomores because age three is the second year of racing eligibility.  

Spit the Bit
A term referring to a tired horse that begins to run less aggressively, backing off on the "pull" a rider normally feels on the reins from an eager horse. Also used as a generic term for an exhausted horse.  

Sprint
Short race, less than one mile.  

Stakes
A race for which the owner usually must pay a fee to run a horse. The fees can be for nominating, maintaining eligibility, entering and starting, to which the track adds more money to make up the total purse. Some stakes races are by invitation and require no payment or fee.  

Stakes Horse
A horse whose level of competition includes mostly stakes races.