Hand walk him up and down that road once or twice a day. Stop at scary things and show them to him. Don't pass it until he relaxes enough so that he wouldn't be unsafe under saddle. Start exposing him to scary things as home, hula hoops, noodles, garbage cans, loud noises, balls being pushed towards them (dogs!)/over/under, car horns, engines, other animals... Whatever. The more you expose a horse to the less they will be afraid of when something new comes at them. For example when you horse doesn't give a hoot at a ball rolling at him quickly a dog isn't much different, or a garbage can. I guarantee they will, at worst, spook less then they would have if not exposed to those things.
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I was thinking this at first also, but the more I think about it the more that seems to teach the horse to act scared anytime they don't want to do something and we won't make them.
I was also going to add the part about desensitizing with loud noises and such at home(which I kinda agree with), but not much for a lot of the other stuff in an unnatural way. I have large pieces of visqueen stuck on tree limbs all over top of the hay bale and along the fence line tree limbs to get them used to seeing and hearing plastic flapping in the wind. I do not go walking around them with a milk jug full of rocks or throwing rabbits at them(extreme I know,lol).
When I've ridden them in new areas where they have spooked, mind you I am by no means a professional trainer, I deal with them then and there on getting over that fear so they know to trust me and let me make those decisions rather than them worrying about whats around the next bend.
So far I have been successful in this method and the last several rides we've gone on in unknown territory they have not spooked at anything that ran across the trail just in front of them, big rocks on the side of the path or even the bale of hay at the end of the road. Things that similarly spooked them before. I would say it has a lot to do with us getting to know each other on the trail and in the yard.
Like I stated earlier, I'm not a trainer outside of my own horses and could be wrong on my approach, but it is working for us. One of the horses was the flight type of spooker and the other was a in place spooker so it wasn't just one or the other that I was dealing with.
I suggest you trying a few different ways until you find one that is comfortable for you and your horse then be CONSISTENT!!! I read and watched several different ways to do it and pulled a little out of each one that was working for us.