I did that I my last pen, it was 400SqFt and built upon over two years worth of "oak droppings", so I just let then decide on a corner and dig in. Once they had made a stable choice I stirred in some DE* and fine sand as the decomposed leaf litter had no grit in it. The run I have now has a hardware cloth floor so that's obviously not going to be an option. I do let them out to free range (supervised) for a couple hours every now and then but that's not enough and I really don't want them just digging up any spot of their own choosing.Yup...why I just let them make their own dust bathing areas in the 'dirt'...which rather sandy here.
I hope so. Mine are also ignoring their new dust bath in the run. But they go outside every day, and I know they won't want to when we have 2-4 feet of snow! I plan to give them time!I've tried a dirt/sand mix and they just ignore it and wait until I let them out to free range.. then dig holes in the barn aisle. Maybe adding peat moss would help entice them to use the box I made up for them?