Just had a fox make another run through the free range flock. Had thought I had a hawk, but nope, this time it was a HUGE fox. My coops are secure enough but the runs have just flight netting as a roof. I doubt I can roof the runs due to the size and shape so I think I need to think about an electric fence. Will an electric fence keep out a fox? how many wires do I need to run? And since I need it ASAP, any recommendations for a charger I can run out and buy at TSC now?