I've been hounding coop design/run design picture postings for a while to get the best picture of how to tweak mine that is in progress. I'm ready to move the coop into my yard, but as far as the run goes-----what is the best medium? I see as many people with grass runs and sand runs and dirt runs... What are the pros and cons? I live in the northwestern part of PA on the shore of Lake Erie. Our weather gets tempered by the great lake, but we still tend to have a lot of wet weather. My yard grows grass and plants like a jungle, so I don't necessarily think soupy yard would be an issue, but then again I've never had chickens before, so I'm not sure if I would be better off leaving the grass in the run or putting in sand or soil. Ideas/input please?