We are about to begin construction on the large run. It will be probably 50X50 or 75X75 feet - wooded area. About 50 feet from the house. No way to cover the whole thing, so thinking of the "panic room" idea in the event of ariel attacks. Not to many hawks here - plenty of crows and geese haha (CAAAWWW CAWWWWW!!) What do I need to consider as a MUST HAVE, and what can be disregarded as eh, whatever's? My main concern is the occasional wandering dog, possum, coon.. the gals will be locked up in fort knox at night - so daytime will be my only problem.. its pretty uneventful around here. My neighbors chickens have done well, only one loss in 3 years, and that was when she didnt lock them up at night, has horrid fencing and something drug off one hen. Anyway - ideas for a large run, fencing type? Construction? Would barbed wire around the lower outer perimeter deter dogs from digging? Barbed on top outer perimeter keep things from climbing in? How high should fencing be? Will hens try to fly out?