As a followup...It appears the hoof caught him flat on. If it had hit at an angle it would have been a lot more serious. He had a serious concussion and that side of his face is pretty cut up. He's covered with stitches. Nothing's broken, though. They're doing another CAT scan this morning to make sure all is ok and he could be home today. He's all swollen and black, though. At 70, he'll be a while healing up.