A halter (US) or headcollar (UK) is headgear that is used to lead or tie up livestock and, occasionally, other animals; it fits behind the ears (behind the poll), and ... https://en.wikipedia.org/wiki/Halter
Halter is a type of horse show class where horses are shown "in hand," meaning that they are led, not ridden, and are judged on their conformation and suitability as ... https://en.wikipedia.org/wiki/Halter_%28horse_show%29