I have a problem with my horse. Our pasture is connected to the barn. At night, I call my horses in to eat their grain. My big standardbred always CHARGES in. When I go to let him in, he charges out. I am worried about my own, his, and other people's safety. While I was in Florida, my grandfather was left with the horses. One night comet came FLYING in, fell down, and slammed into the wall HARD. He tried to get up and fell again and slammed into the wall. What can I do to get him to come in safely?