i have a horse, which is 31 yrs. old. i noticed him straining to urinate and that he was also puffy down in that area. the vet came out, took bloodwork on him, put him on a diaretic. we were thinking some kind of organ failure. bloodwork came back normal. so.......vet came back, cleaned his sheath and put him on antibiotic, as i thought maybe he had an urinary tract infection. hes still puffy down there, havent seen him urinate but hes eating all his food. hes not a big drinker. this horse is outside all the time, so im not sure on how much he drinks or urinates. anyone have any suggestions for me?