My chicks are 10-weeks-old and have been out in their coop/run/pasture for 5-weeks. They tend to dust bathe in the run where the ground is all dirt and not grassy. It's been raining here in upstate, NY and that's got me thinking--do I need to make an indoor dust bath for the chickens for the winter? The coop is 10x10, so I guess I have room, but where to put it?!? What do I put in it?