Overreach injury - occurs when a hind foot moves too far forward and strikes the back of a front foot. It can cause lacerations, bruising and pain in the front hoof.
Rule 4 - If a horse is withdrawn and there is insufficient time to form a new market the remaining horses in the race are subject to a deduction if they win or are placed. These are calculated according to the starting price, the shorter the odds the larger the deduction.
Teaser - stallion used purely to arouse the mare to be covered before her intended sire arrives on the scene.
The teaser never breeds to the mare (except in very, very unusual circumstances) but her behaviour reveals whether or not she will be receptive to copulation.