So I no longer have chickens. We allow them to sleep in the run until it gets cold and have done for 8 years now, last night a nasty fox came and got into the run and killed them all. We have an early cube and had converted the end panel so you can step in as it only had a free ranging door so you couldn't clean it out. anyway it involved velcro fasteners and the fox had ripped them. I honestly never thought it was a risk we have had them so long. I am heartbroken.