I have a 20 year old QH gelding who is kept in pasture 24/7. For the past two years, every fall, he gets "infested" with Bot fly bites. Like all over his body. But He gets over them after I spray fly spray and worm him. After the first encounter he became out of shape and breathed heavy, and the vet said he was probably just out of shape and showing signs of age.
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.