Well, you can laugh if you want, but are there any exotic animal farms/preserves near to your friend's place?? Here in Missouri, they get in rare animals to use in private hunting preserves. Most of these idiots go broke within a few years, and instead of selling or disposing of these animals properly, they turn them loose! About 10 years ago, I had a lion/tiger type animal run me, a friend, and my son in the house with a huge roar. Thinking it was probably a bear, I went out with a 12 ga. to fire a round in the air to run it off. Instead, it roared again, then paced our fence line in the woods (never did see it), for at least two hours, huffing and snorting! Called the Game Warden, but by the time he got out here, whatever it was, was gone. He thought bear too, but when I told him what it sounded like, and that a shot did not scare it off, he told me of these farms, and all of the strange animals that were showing up at the local taxidermists! There were 3 of these farms in my immediate area. Ggggrrrreeeaaattt! About a week later, I came home to find a set of LARGE catlike tracks in my driveway, about 15 feet from my front door. I've hunted these woods for the last 20 years, and NEVER heard that noise before. It sounded like an African lion roaring! It has not been back, thank God, but who knows what may still be out there? My son also told me he saw two men taking a large dog crate out of the back of a pickup near our house, and he said what jumped out and ran, looked to him like a hyena. I laughed at him first, but when we looked on the net, he pointed out what he saw. Said it went running and yipping towards the woods and bluff across the road. So, who knows what may have gotten your friend's horse. If it was clawed it was a big cat of some kind. Find out if there are any animal preserves around that may have lost some of their animals. Also, you may want to call the Conservation Dept. or Fish & Game in your area. If it is a legal game preserve, they have to have a license. If illegal, good luck!