Sharon Camarillo Over & Under A sure fire way to "chase" your horse forward in training or across the finish line. The unique attachment allows the over-under to stay put on the horn and, at the same time, the adjustable design allows for lengthening and shortening depending on the size of the horse. The fine workmanship and the quality Harness Leather makes this over-under a necessary piece of equipment for any level of rider or competition.