I suggested that bc I know a horse who would randomly fall down..then get right back up.lol.in the title of ur thread it said "and he's down..." so I figured he fell down alot. That's what my trainer did to see if he had it.i think he ended up having it too. I didnt know much about it but I looked at that pae I suggested and I learned a few things.it seems very possible that that's what he had..im not sure where about you live but it could be very likely here considering we have lots of oppossums. Good luck with your horse though! :)
If my horse doesn't like you then I don't either.Deal with it!