I just acquired a old mare after being without horses for 13 yrs. I live in utah now which has way more wet and snow then california. So I am not exactly sure on how to deal with all the muck/mud and I want to be prepared for winter. I have her in a 25x25 ft cattle wire/wood fenced pen. On the low side of our yard (our whole property/street slopes to the south.). And we have that nasty red clay that can just sink you in and not let go (i'v lost many a shoes after the melt). Anyways she tend to hang out and stomp around by the gate her water and feed barrel. I was thinking sand but then I thought sand colic that its not good where they eat and well this is where she eats and actually she eats all over we have high winds on top of the mess so it blows her hay around a bit when she yanks it out her bin, maybe DG or limestone or pea gravel, what should I use? Will/can any of those cause colic? Any other ideas? I am hoping to build her a lean-to or something before winter also but that still isn't going to keep much of a mess away. I need Help with ideas?????