He probably is afraid of it. It's a very normal thing for a horse to fear. I just had an idea of something you might try. You could set aside an entire day to helping him get used to it. You could start by hanging it on the fence and seeing if you could just get him curious about it, and gradually work your way up to touching him with it and putting it on, taking if off, putting it on again. Approach and retreat desensitization (in natural horsemanship language), or progressive down-regulation in sciencey animal trainer terms. All it really means is, take your time and let him get used to it. XD
I'll be real though, I get on the soapbox about blanketing. =P I spent a few months last winter blanketing my horses, and it never really did them any good. Plus, they all bit the blankets off of each others' @sses and ruined them. LOL. What keeps a horse warm and growing a thick winter coat is having hay to eat all night long and especially through the coldest part of the night. It keeps the fire burning, so to speak. Same as with you and me. When it's cold out, getting some food in you (calories) warms you up.
Last edited by Ian McDonald; 11-25-2012 at 02:50 AM.