There is a horse at our barn who is a 5 yr old quater horse. She has always acted really strange ever since she got there which has been about 7-8 months ago. Now its beginning to get worse. Her coat is really thick and isnt shedding, her back feet are sort of lame, she's getting more food and supplement but not gaining any weight, she's becoming pot-bellied, and is almost always laying down. The vet and I suspected that she has cushings disease but I did some research and all of it said that it only affects horses as old as 10 and up. Any suggestions as what it could be? Ill try to get a picture of her as soon as possible.