There's a young woman in the Pacific Northwest who does her trot outs at endurance rides with a collar.
Sort of like this one: http://www.valleyvet.com/halters/Free-Head-Horse-Collar I am not quite sure what the purpose is, but the horse is beautifully obedient. She rides like a wild woman and won everything about a seaon ago. I was a little worried for her horse, but learned later she is a veterinarian. I assume she's doing a nice job with her conditioning and monitoring. Nancy
