I am having a friend build a coop to attach to my 8 x 12 cyclone fence run. Can I leave the bottom with just dirt, with shavings put over it, or do I need to have a wood or cement, etc. floor? It is in a corner of my yard and will abutt my fence on two sides, the open run on the third, and my cement walkway on the fourth. (Hope this isn't too confusing!) The run is also covered on the top. So I'm thinking it's pretty well sheltered and the floor should not get wet when we have rain (I'm in California). Do you think this will be okay, or do I need to put in a solid floor? I'd appreciate any and all advice. Thanks!