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 hes down..." so i figured he fell down alot. thats 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 thats what he had..im not sure where about u 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!