Our property used to be a chicken farm of some sort but all that is left of it are some large concrete slabs. I'm thinking about putting a chicken run there so I can be certain that nothing will be getting to my chickens during daylight hours when I am not out there with them. The slab itself is 25 ft wide and goes about 75 feet back but I think for starters I will just do 25x25. How should I go about putting fencing around this? I think I've decided on using 6ft high 14 gauge welded wire with a 2x4 mesh. I can't dig through the slab (but it does have about 2 inches of gorgeous dirt on it from the past 50 years), so will I have to go outside the slab and bury the fencing or is there a different way? I want to really stay within the concrete slab because going outside will me a bigger perimeter which means more $...which irritates DH. As it is, I think these chickens will be ruin of our marriage anyhow Not sure if I will eventually cover the bottom 36" of the welded wire with hardware cloth. This run is mostly for daylight hours when I cannot be outside with the chicks. We have a fox that is brazen enough to come within 50 feet of my daughter in broad daylight while stalking my chickens.... I know they will climb chain link, but will they climb welded wire with a 2x4 mesh? So all you wise chicken tenders ( ) how do I go about building this run? Can I cement the bottom of the fence to the concrete slab? Would I have to dig through the dirt to get to the slab or can I cement right onto the dirt? Or will I have to put something like railroad ties to attach the fence to? If I do that do I need to attach the railroad ties to anything? Or is it my best bet to just dig the perimeter of the concrete bury some of the fence? My main concern is the fox. Thanks all!