This may sound kind of weird, but it's been bothering me so I'm going to ask. So you know how most horses flip out if they have a horse fly on them. Well I have a gelding that will swat and fling his head at horse flies except on his back legs. It's really weird. If one lands anywhere else he goes for them but if it's on his back legs it's like he doesn't even feel them. I come out sometimes and he'll have 6 or 7 on one leg, and there is a bunch of dry blood on them. I'm not asking what I should do about it because when I see that he's getting bit up I have fly boots for him. I just wanted to know if that sounds like anything to you all.