Yikes, I just looked out my window and saw a fox trotting through our neighbors yard behind my house (and about 40 feet from the hens). Have a very secure small run and coop, but during the day I open a door to let them into a large run that's hardware cloth sunk and wrapped up sides over chain link, but just covered with chicken wire (had been concerned about hawks, not daytime foxes)! We are in suburban St. Louis in a subdivision of quarter acre lots, but there's a park about 100 feet away with cover. He was trotting towards the park. Do I need to do something different with the covering of run or would it seriously jump up there and gnaw away at the chicken wire in the middle of the day with houses, people in earshot, barking dogs all around? Chickens are ALWAYS locked in coop at night and door to secure small run shut, so two layers of protection then. Electrified fence not permitted. Attached a picture. Fox was under deck of the house behind you can see in photo. Girls are locked in now for sure!