We have terrible soil. It is super rocky and the remaining soil is sandy. It packs down and is like a clay when it gets wet. I was thinking of putting leaves and wood shaving in the run area, but not enough to have it be super thick. It is up a steep high hill and everything we put in there needs to be haul by hand up the difficult hill. We live in San Diego with little rain here, so it shouldn't be rainy/wet for very long. Will the rocks be a problem on their legs and feet? What do you think? You can see how steep the hill is from the last picture. That's our blue house at the bottom of the hill.