I have many fox problems with my chickens. The chickens are free range whenever we are home or on the weekends, when we are not home , we keep them in their run. Their run is about 5 feet tall , made out of chicken wire , it has plastic stakes keeping it in the ground. There is no floor to their run. We usually get attacks during the day , when they are free ranging. Is there any way to help prevent fox attacks, besides keeping them in their pen?!