I have a feeder barrow, around 150#. He is bleeding profusly out his nose or mouth. I first noticed a small amount of blood a few days ago. I thought it was a minor injury of some kind. This morning there was at least a pint if not more blood on the ground near the pigs mouth. The pig has a good appitite, and is active and alert, but does look run down. Any ideas what would cause this?