Wow! Really? I have never had an issue with them not preferring sand, but... in fairness, sand is their very first available dust bath. I introduce them to their first sand bath at about 3 weeks of age, just days before I start weening them to the great outdoors with loads and loads of places for them to duck behind, under, in and around to avoid the adults when needed, and I even have it so that they can get into their brooder but the adults cannot (for those that prefer the familiarity of 'home'.The tricky part is getting them to use it though. My chickens refuse to dust bathe in any kind of sand. They'd rather dust bathe in wood chips