Bless him, he mad it till 3 weeks ago till his legs went, and they've not got any worse at all since the muddy buddy/hypocare/sudocreme regimen started. But today he had a right snot on, and investigation showed that he had 5 small areas of mud fever by his sheath.
Its been hypocared and plastered in sudocreme, and he's gone back out without a rug so theres nothing rubbing and I wondered if his (no fill) rug was making a bit of a damp enviroment.
Any other ideas? He doesn't have a stable, so bringing him in is a last option