I'm serious! I've been really paranoid since I saw the big dog trying to tunnel under. I'm afraid he's going to grow thumbs and figure out how to pull my door open. It's all hubby can do to keep me from building a concrete retaining wall around the whole thing. (Since we move it once a month or so, that would be hugely impractical. LOL)
I just keep telling myself if the dog can drag off a concrete block, then I'll just have to rethink my whole chicken pen strategy.