I always thought mine were safe if I shut them in every night, I never imagined foxy could chew through the roof. I have lost loads through letting them have the run of my 6acres, so have had a run built for them, looks like Colditz, and am dreading the bill. One day one of the girls was s**t picking in the field and the fox came right up to within 10 feet of her and made off with one of my best layers.