As you may be able to tell from my user name, I typically hang out in the goat forums. But, my homesteading adventures have recently taken me into the equine world as well! We purchased a 15 yr. old mare about 4 months ago and she been struggling with a VERY thin coat ever since we purchased her. We have been putting a hair growth spray on her and tried adding kelp to her diet, but it doesn't seem to be improving. Most recently, she came up with bald patches around her bridle area, under her mane, and on her loin/croup area. She doesn't seem to be itching and it doesn't seem to be painful to the touch. Several folks suggested it was a fungus or maybe related to flies or rain rot or maybe even a hormone issue. It is hard to know how to treat something that isn't defined. I am posting a couple of pictures and I would love to get input! Thank you!