I have a horse that is 10 years old, and over the past couple of months, he has just seemed to be going downhill. He has seemed depressed, he has lost some weight (enough to be quite noticeable), and alot of muscle loss, (backbone sticking up, topline sinking...) He isn't "my" horse, a family friend has let me take him and work with him to see if he would do barrels, hence the reason we haven't put alot of money into him for vet visits. Starting a couple months ago, he seemed to get worse and worse when I would ride him. He has always always been pretty good about picking up his corrects leads, awesome at doing flying lead changes, etc. He would no longer pick up the right lead, and flying lead changes were a thing of the past... and he would just seem to look a little more poor each day.... we would actually joke and say that he looked 30 instead of 10... He gets fed on a regualr basis, and has a wondeful appetite. The pasture that he is in is full of some mean horses that do nothing but bully him, and treat him as an outcast. He has been at our barn for over a year, and he has never been accepted by them. We originally thought that might be where some of his depression was coming from.... but now that he has seemed to deteriorate so quickly, I don't think that's it anymore. I havent been riding him lately just because he wasnt riding well at all, and he just seemed to be depressed. I've been very worried and uneasy about his health, and would just really like to know if anyone has any idea what this could be? Thanks so much!