If there was one most preferred product for making a dust bath what would it be? Playground sand? Letting them find their own in their run...How about getting them chinchilla dust? Would that be too fine? I want to provide them the best possible... Also what is on the bottom of your girl's run? I have a few options. Straw...pine shavings (wouldn't that just get gross and matted??) Sand...half one one substrate, half the another?? Our coop will be located in an area that has rather compacted dirt. And I;d like to give them some sort of better substrate to peck around on outside of their "dorm".