yesterday my gelding Cookie Monster came up with a severely swollen sheath. the farrier looked at him and just said "ouch" I had the vet out today, he cleaned him out but there was not much there ( I cleaned him a couple of weeks ago) there is no infection or heat. he can drop and pass urine without trouble however his sheath is the size of a grapefruit he also had another spot of edema on his midline. the vet took a blood sample to check kidney function and liver. the only thing we can think is that the pony kicked him. he has recently lost a little weight. he is turned out 24/7 he is the only horse in the field with rear shoes everybody else is bare behind. he is second in the herd to Sailor my mare. anybody have any ideas ?