I know this movie well. My horse, who I've had for more than 15 years, can be an OCD pacer like yours. I've worked out what triggers it, some of which is manageable and some of it isn't. Adding to the complication is the fact that she needs to be in individual turnout as she is a danger to herself and others when in a herd. She will stop pacing and come to you and practically put the halter on herself if you go into the field to "rescue" her, and she isn't aggressive. So that's a whole different issue you have there.
Try to work out what causes yours to pace and see if you can figure out what can be changed in his management to reduce the pacing. This might mean moving barns.
Triggers for my horse include lack of routine, both for herself and other horses on the yard; being in a field where neighboring horses can go out of view behind a hill or whatever; not sharing a fenceline with other horses at all; bad weather; me riding another horse at the yard; being too attached to one other horse.
With the routine thing, I've stopped keeping her at DIY yards, which isn't really a thing in the States anyway, but it is very common here in the UK. Owners turn out, bring in, feed, etc their horse as suits them, so all the horses on the yard are on different routines, which vary from day to day. This turns my horse into a pacing mess.
I make sure she is at a yard where the set-up suits her. She's in her own bit of field, but with horses on all sides. The fields aren't huge and they are on fairly level ground, so the horses can't disappear. Because there are more than half a dozen horses she can interact with over the fence, she doesn't get too attached to any particular one.
Sometimes (well, it's Scotland, so a lot of the time) the weather sucks and sometimes I get paid to work with another horse. In those cases, life is tough and she is going to pace. I suppose the weather thing could be workable if she had a field shelter, but show me a livery yard with individual field shelters for each horse, and I will show you Santa Clause. So I have to live with that. But my management and finding the right barn for her has significantly reduced the amount of things in her life that set it off.
So look at how your barn is run and see what can be changed or what other barns might offer in terms of a boarding situation that will better suit him and his neuroses. It is a pain.
Last edited by thesilverspear; 05-31-2014 at 08:09 AM.