The Horse Race.
All riders must try to give his horse the chance to do as well as it can.
If a jockey is dismounted, he/she may remount; but the horse must be remounted where the rider fell. The rider may be assisted in remounting the horse.
A horse will be disqualified if it receives assistance from anyone except its jockey in jumping a fence or hurdle that it has refused.
If a horse misses a fence or hurdle, or passes the wrong side of a direction marker, it must return and ride the course correctly or be disqualified.
A horse will also be disqualified if its rider, by foul riding, jeopardizes another horse's chances in the race.
A Horse May Be Disqualified, Or Its Placing May Be Altered If:
in a steeplechase, or hurdle race, it crosses and interferes with another horse at, or in the home run from the last fence or hurdle;
in a flat race, it crosses and interferes with another horse in any part of the race.