I have a flock of 19 free range (during the day) chickens of a variety of breeds. They are digging holes on the edges of the lawn for dustbathing and my husband is annoyed. He says they're ruining the lawn (although the grass has grown back in the spots they have dug out previously, it IS a bit bumpy from the holes). Will providing them a small baby pool with sand/dirt in it likely satisfy them and keep them out of the lawn? Or am I just wasting my time and money on that?