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How to train a horse to lead
Get a nice soft halter.
If you are teaching a young, you must first teach it to wear a halter. The halter (sometimes known as the headcollar) is the harness that you will place over the horse's head, around the muzzle and up over the poll and ears.
You can buy these at any horse supply or tack store, or you can always find one online. Make sure you buy a soft halter, since hard poor quality nylon will rub and can cause sores on your horse's sensitive skin.