Lisa,
Your colt is just being a colt and doing what they do best, causing trouble! This is exactly why it is not recommend that novice horse people deal with young horses (colts can be much more of a handful than fillies). There are several Q&As on my website about this sort of behavior. Your colt doesn’t mean anything by it, nature programs him to ‘spar,’ which is simply play-fighting. But even though it is meant in playfulness, it can be quite deadly.
Like all youngsters, he just needs to learn his manners, learn the basic rules of behavior and learn to respect his boundaries. These rules and boundaries are explained and demonstrated in detail in my groundwork videos, Round Pen Reasoning and Lead Line Leadership. You can order them online at www.JulieGoodnight.com or by calling (800) 225-8827 during business hours.
In particular your colt needs to learn that when he is being led, he must remain in a very particular place, beside you and behind you, very aware of your space, stopping when you stop, going when you go and NEVER getting in front of you. He must be corrected immediately whenever he is not in that place. As you have discovered, letting him run off in front of you is not only rude but very dangerous and this behavior needs to be nipped in the bud before it becomes engrained and before someone gets hurt.
There is lots of info on my website on the subject of unruly colts and of teaching a horse good ground manners. However, you may need to get some expert help, so this bad behavior does not continue and so that no one gets hurt. Good luck and be careful!
JG
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If you liked this article, Julie suggests the following products to help you continue the work with your horse (or call 800-225-8827 for ordering help):
From the Ground, vol. 1, Round Pen Reasoning: http://www.shop.juliegoodnight.com/shop/trftg1roundpenreasoning.html
FTG, vol. 2, Lead Line Leadership: http://www.shop.juliegoodnight.com/shop/trftg2leadlineleadership.html
Basic Ground Work Package: http://www.shop.juliegoodnight.com/shop/packagebasicgroundwork.html
Goodnight's Complete Groundwork Package : http://www.shop.juliegoodnight.com/shop/packagecompletegroundwork.html
Helmets and Boots: http://www.shop.juliegoodnight.com/shopforjuliegoodnightwear.html
Goodnight's Quick Clip: http://shop.juliegoodnight.com/shop/bsequickclip.html