Denny & The Ribbon Wand
I love using my trusty ribbon wand. It's a great tool to use when desensitizing a wild mustang. You can toss it all over them. Around their legs, in their face, and have them get use to being touched all over and sudden movements.
Start slow with the ribbon want, then pick up the pace. If you're horse doesn't seem bothered by it, great! Now put a little more energy and pressure into it.