Gait
The characteristic footfall pattern of a horse in motion. Thoroughbreds have four natural gaits -- walk, trot, canter and gallop. Thoroughbreds compete at a gallop.  

Gap
An opening in the rail where horses enter and leave the course.  

Gate Card
A card, issued by the starter, stating that a horse is properly schooled in starting gate procedures.  

Gelding
A male horse of any age that has been neutered by having both testicles removed.  

Girth
An elastic and leather band, sometimes covered with sheepskin, that passes under a horse's belly and is connected to both sides of the saddle.  

Good (track)
A dirt track that is almost fast or a turf course slightly softer than firm.  

Grab a Quarter
Injury to the back of the hoof or foot caused by a horse stepping on itself (usually affects the front foot). Being stepped on from behind in the same manner, usually affects the back foot. A very common injury during racing. Generally, the injury is minor.

Graded Race
Established in 1973 to classify select stakes races in North America, at the request of European racing authorities, who had set up group races two years earlier. Always denoted with Roman numerals I, II, or III. Capitalized when used in race title (the Grade I Kentucky Derby).  

Graduate
1) Winning for the first time, horse or rider. 2) A horse that has moved up to allowance, stakes or handicap racing.  

Grandsire
The grandfather of a horse; father ("sire") of the horse's dam or sire.