Reasons for using a bit guard include:
- to protect the horse's lips from chafing or pinching by the bit rings
- to provide a better fit when the bit is too wide for the horse's mouth
- to prevent the bit rings from being pulled through the horse's mouth
A pair of bit guards is placed on a bit by stretching them to pass over one bit ring. Then the bit is attached to a bridle. The bridle is then put on a horse so that the bit guards lie outside of the horse's mouth. Bit guards are used with loose ring snaffle bits, gag bits, and pelham bits. Bit guards are used more often in jumping events, such as eventing and show jumping, and in polo. They are not permitted in competitive dressage, and are not used in horse show hunt seat competition.
Resembling a bit guard is a bit burr (sometimes burr bit, also bubble cheeker in Australia), which has teeth laid against the horse's cheek. The burr bit was for a time widely used on coach horses in New York City, until the use was stopped in part through the efforts of Henry Bergh circa 1879. Bubble cheekers are approved for use in thoroughbred racing in Australia.
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- Wood, John George (1885) Horse and Man: Their Mutual Dependence and Duties, Longmans, Green, 339 pages, page 221.
- Dion Villella. "Register of Nationally Approved Gear" (PDF). Racing Victoria Limited. Retrieved 2010-12-03.