I've seen a lot of threads mentioning Cushings in horses, and have done a little research, but nothing really explains what it does to a horse long-term if not treated. Eg. if you have a pasture pet horse who is never ridden (but does have regular hoof trims), turned out 24/7 on grass hay and seems happy and content otherwise (and in good weight), would testing for Cushings (and treating) be worthwhile? Is the testing and/or treatment expensive? What are the implications of not treating it?