I have about 7 young chickens that are about 21 wks old. Right now they are in a pen with a dirt floor until I get their final coop& run built in which I plan to add sand. I've never seen them dust bathe but I let my younger ones in to visit for a bit yesterday and they immediately started trying to scrounge up enough dirt in a pile to bathe. Later on I seen a few of the older ones trying it out. I was wondering if I should add a big pan of some kind of litter for them to roll around in since that would be easier for them. The dirt seems a little hard even tho they do scratch around for their food. There just doesn't seem to be enough loose for a good bath. If I use the litter, is there a kind that is better. I don't want to put anything in there that would harm them.