Okay so today my mom and I went out for a trail ride. We were going along just great and then out of no where our mustang that my mom was riding decided to lay down and she about rolled with my mom on her until she jumped off. We don't know why she's did that and she did it yesterday on the trail to. My mom's theory is at the spot she did at both times theres sand right there and my mom thinks that maybe she likes the feel of the sand or something. The other idea we had was possibly because the people who owned her before us had taught her how to bow and were in the middle of teaching her how to lay down for people to get on. I'm not sure if any of these theorys we have are even right or close to right...who know maybe she's just a brat. Ut she only does it when were going thru the sand portion of the ride. Any other ideas on why she's doing this? Also is there a way to break this habbit?