I have a coop with a covered run that i have just sitting on the ground outside. It quickly became a dirt floor. Is it a good idea to lay down wood shavings on the dirt floor outside? (I have it inside the coop to absorb waste and change this about once a month.) It is a small coop that holds no more than 4 chickens, more and they would be over crowded. I'm just now sure if there is a point to it or not. Suggestions?