I am having the worst time trying to keep my black lab away from the coop. She's very talented and has managed to get over, under, or around any regular fence I put up. She managed to break in once and killed 2 of my girls. I'm thinking the invisible fence around the coop might just do the trick. Anyone have one they are looking to sell (hopefully fairly inexpensive - can't afford a lot with Christmas coming) please PM me. Thanks!