I've thought about using sand too, but my coop has a dirt floor; it's not a raised coop. It's a custom built little building for chickens. The sand would definitely get muddy. I I might put in pine shavings too....I've put down straw before, but boy, does it stink! The ammonia got really bad in there. I may also pick up a small bag of Koop Clean; has some odor neutralizers mixed in. I also found out they sell Chick Flic at Ace Hardware. You sprinkle it on your bedding to help neutralize odors.....