This question covers a couple related issues, but here is the primary one: I have a run which is roughly 10'x15'. The walls are 4' high 2" square wire fence (lined with plastic chicken wire from when they were chicks). The posts are widely spaced medium duty T-posts. In order to secure them from predators from the sky, keep out wild birds, and keep them from jumping out into my yard, I covered the run with a bird netting roof. The other day, it rained a decent amount and the netting was drooped down to about 3' from the ground. We get a lot of sticky, wet snow in the winter. I'm concerned that I will be fighting a losing battle if I leave the net up, but I really don't want to have my chickens escape and be eaten by loose dogs (lots of them) or piss off the neighbors. Will the chickens jump a 4' wire fence? I plan to shovel the run in significant storms, so the full fence height will be at least 3'6". FYI, I have 6 Rhode Island Reds who definitely can't fly, but I have seen them jump to get a leaf offered at 3-year-old-kid head height which is about 3'6". I just don't know if they could make it the last foot or so to get their feet on/over the wire.