If your horse is lying or stretching quietly on the ground, it is okay if he is resting quietly, let him be. He is trying to get comfortable. But, you should never allow a horse with this problem to lie down and roll. He can twist his gut, and then you have major problems. A twisted gut occurs when a portion of the intestine becomes wrapped around itself. In such cases, the blood supply is cut off and will cause severe pain and possible shock. This will require surgical intervention immediately.