I have four Icelandics ranging in age from 3 to 20. None of them shed out well this year. I had the same problem 2 years ago and it turned out to be a vitamin problem due to living in Alaska. I have all of them on whole corn and Millennium Gold (new Alaska formula). 3 are out on grass, one is on hay. I don't think Cushings is a issue. They have plenty of energy, are carrying good weight (the 3 year old stud, he is a little light), hoof growth is healthy and everything is moving in and out just fine. I just wormed with Ivermectin last week. We are getting about 21 hours a day of sunlight and have had over two months of hot weather. The vet wants to do blood tests on all 4 ($1,200), but my husband is out of work and I can't afford it. Any thoughts?