I agree about the straw/hay. I learned this lesson over the past weekend. We had gotten some straw to use when the babies were born. It wasn't asorbent enough for their run, so we moved it to the big girls run. They seemed to love it and it stayed dry and worked fine for awhile. Over the past couple of weeks, I noticed the big girls" run was smelling more, but also knew we had not been able to get in there and clean it out as well as usual. Fast forward to this past weekend with the high temperatures and me deciding to wet down the run for the girls. Big mistake. Oh my. I got some of the straw (mostly disintegrated) out on Sunday and the rest will be out in the next few days. My hope is to have sand down in the next few months.