These are some tips on how to tie up a back leg on a horse. This, and training a horse to stand hobbled, is good training, even for a gentle horse, to get them used to having something around their legs—like tangled up in a longe line (especially the flat, nylon type that are a little bit like a saw), or a lariat rope. Or, worse yet, a wire fence. A horse, taught not to fight things wrapped around his legs, is more apt to stand while you pick him out of a tangle rather than pealing of a bunch of hair and hide, and tromping all over you while you are trying to rescue him.
A word of caution, however. If the horse is a little bronky, much care must be taken when putting this stuff on—other wise you might get your lights kicked out
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From Surviving The Western Horse