So this post is really just because I'm curious -
At the therapy barn I work at we had a horse who would spontaneously drop to the ground and roll, even with a rider on his back! He was sold right about when I started working there, but I saw him do it a couple of times. You could be walking, trotting or cantering he would finally decide he was done - he would stop - drop and roll. It didn't matter if it was a therapy lesson or a recreational lesson. He did it most often when he was stopped while they played a game.
I've never even HEARD of this, I mean I've seen trail horses want to roll in good dust or mud, but not rolling to off a rider like this. Typically you have warning too, they stop and smell the ground and ease themselves done - this horse just stops, drops and rolls.
I guess I'm curious if anyone else had heard of anything like this and what you would do to fix it?
When the instructors schooled him he would do the same thing and they'd get him up as fast as they could and work him again, but rinse and repeat - on the lunge too he'd do the same!! So you couldn't even lunge him.
An college girl bought him to be a trail bum, he never did it on trails.