My husband used welded wire for our run. I could not talk him into hardware wire at all! His reasoning was that it's more difficult to view the chickens from the outside with the hardware wire.. My hubby is pretty convinced that nothing can get through the welded wire. He buried it into the ground also. Can weasels get through the openings of welded wire? We did use chicken wire at the bottom on top of the welded wire, so the cats couldn't swipe at the chickens and scratch them. Because of the welded wire and not trusting it, I did not allow hubby to cut a pop door through the steel door leading out to the run. I close the door each night to ensure the safety of my girls. I'd like to leave the door open during the hot days, but I'm afraid weasels and other predators can get through the welded wire.