I've been watching with much interest - we just bought this coop -- http://www.mypetchicken.com/PicturePop.aspx?image=images/product_images/Popup/CC4.jpg and are deciding on fencing. For the run -- We will be burying the wire fence in the ground, putting wire fence across the top, everything the best we can. However, I got to thinking about the door/gate to the run. Since you can't bury part of the door, how do you secure to know an animal can't just dig right under the door. Any suggestions?