First the horse has an apt with the vet on Monday anyway, but I witnessed him do the weirdest thing yesterday. He has multiple problems (hense the vet apt Monday), but yesterday I was watching him doze in the sun, he was sternal and then layed over flat, and I'm thinking "aww how cute look at him nap". All of a sudden his back legs snapped up to his belly and his whole hind end started spasming, then they kicked straight back out. Now I'm thinking "omg is he colicing?" He continued to do this for almost a minute, and then rolled back up sternal with his lip still hanging relaxed, then he just got up and went over and started eating hay like nothing happened. He really looked like his whole hind end was convulsing. Obviously he wasn't worried, but it freaked me out! Any ideas?