I have a huge run for my small five hen flock. Half is straw and the other half is dirt. The feeders are in the middle. It gets afternoon sun and is sheltered from predators and rain. I'm not sure the dirt is good for them or if maybe I should put straw all over. They've never free-ranged. Should I put sand down or sand and straw or what? Last week my son added some grass clippings to give them a treat. Our lawn is untreated. In the past couple of wet weeks I lost one of my older girls to egg peritonitis and my favorite, Mary Louise, this morning to what appears to be a heart attack (if what I read about dark red combs and some open mouth breathing is correct). I'm worried about the rest. And I'm at a loss. The coop is spotless, good food, snacks but not too many, oyster shells and fresh water.