My old horse, King (and ONLY King) is covered with 100s of teensie tiny flies. They look like miniature house flies, very flat bodies. Can anyone tell me what these are and how to get rid of them? I just noticed them this afternoon.
King is the only one who has them on him, I don't see them on any of the other three horses. There are cattle in the pasture to our west (share a fenceline), though the rancher there rotates his cattle and they are not currently in that pasture.