Allison Finch just notified me of this thread. Lol I have a horse with an odd character, and thought I would share a little bit about what I know about Jake and why he lays down.
First of all, I taught Jake to lay down as a fun trick. Well after a few years he when he would get frustrated he would do anything and everything he could think of to avoid doing what I wanted him to do (Like walk...down a trail instead of run) and he would throw a temper tantrum, when rearing wouldn't work he would lay down. He doesn't roll, try to shake me off or anything. Sometimes he'll lay on his belly or quietly on his side, I'll ask him to get back ups (sometimes he gives me a half attempt and will lay back down) but will get up on cue, I get back on and ride on.
Is it caused by frustration? Does she not want to go out any farther? Does she want to go home faster and your holding her back? Is she hyper?
Jake has also laid down to nap in very soft deep sand before when I wasn't paying attention. He naos with me in turn out in the sun from time to time. If you watch 99% of horses will have their heads down, pawing, shuffling, trying to circle. Though Jake is the 1% that can lay down from a rear...
With Jake his main issue was frustration, he would shut down and give up when he reached a certain level. So once I learned to work him without making him frustrated he stopped. It wasn't an avoiding work thing, most of the time it was me holding him back. When he made indications he wanted to lay down I would get my spurs into his side or lay into him with the whip, get him moving. Once he was down, I wouldn't go after him much, do what it took to get him up, and remount! Sometimes I would make him get up with me still on as well.
Here is Jake in all his glory :
((Watch the second half starting at 0:28))
((This video is a year old, and my timing was off/handled it poorly. Jake sidesteps just fine now. I have gotten tons of hate mail/comments on this so no need to comment on that. I don't regret how I handled it, though I don't think I would handle it like this again.))