Those of you who have geldings, any experience with swollen sheaths? I switched JT's heavyweight for the lightweight yesterday and because it was light out I took the time to brush him a little and make sure he was still at a good weight (which he is). His sheath is slightly swollen, bigger than two large marbles but not as big as two golf balls. It's not hot and he didn't bat an eye when we were feeling it so I don't think it hurts him at all. There is no weeping or anything like that and he's walking around fine. Any idea what's causing this, and should I be worried?
He's on 24/7 turnout with two other horses so while I haven't been riding in a few weeks (due to work, weather) I know he gets exercise. He's been on Tribute Kalm Ultra since last fall along with alfalfa pellets and grass/alfalfa hay but we've been reducing the amount of alfalfa pellets so I don't know if it's too much protein. The only thing that's different this winter is that the past few weeks he's had access to the run-in shed and the BO has been putting pine shavings or straw in there as bedding. Maybe he's allergic?
I'm thinking I should call the vet tomorrow but for now I wonder if any of you have any brilliant ideas.