So Today I have him in cross ties and groomed him and put the saddle on and went to go get my bridle, as soon as I turned away he started moving around and started trying to lay down. I kept yelling at him trying to get him to stop but he would just pop up then go to do it again. After doing this a few times, he actually got down, (I managed to undo the cross ties) he layed down flat on his side,(head down and everything), with the saddle on. He scared me half to death! I thought he was dropping dead or something! After laying for a few seconds, he got up and walked off. Then he seemed fine. He got scratched up pretty good but was sound. I lunged him to see if he was ok, then I rode him, he was perfectly happy and good when I rode him.
I am so baffled at this behavior, my trainer thinks it is a behavioral thing, but me and the girl that was in the barn with me don't understand.
Please help me and give your input