It happened again this fall, after a summer drought (here in Kansas). The vet said he was out of shape, so I gradually worked on getting him in shape again. EXCEPT! This time not only does he breath hard, he gets this nasal discharge coming out of his nose, and sounds like he has "congested sinuses" and has "crusty" eyes (dried gunk!). The vet said it was probably just his body being irritated by the dust and pollen. But it's now spring (This all happened last fall BTW) and he's still this way. Heaves would be contagious, and none of my other horses show signs of this. Anyone have any ideas on whats going on?
I've been reading on Upper Respiratory Infections, but I've read that horses usually get over those on their own...but it has been probably 10 months.