My horse is almost 23 years old. He's had a swollen sheath for a few weeks. When I started exercising him more regularaly the swelling went down. Now he's showing some other weird sympotoms. He's still alert but looks more tired than usual. He has a huge swollen abdomin (it's a large lump), very furry, coughing a lot, his sheath is swollen again, he urinates and drinks a lot. I was riding him up until a few days ago when he was just too miserable looking to saddle up. So I walk him around on a lead. Does anyone know what this could be? I was thinking maybe cushings. I am having the vet come out asap, but it may be another week until I can get him to come out. I'm hoping it won't be that long. I'm really worried right now. Any help will be greatly appreciated.