My dogs

We have 3 dogs and they keep getting loose from their cage. I am getting sick and tired of it. My littlest dog is the one that starts it all. He digs out and then the others usally follow. I hope this does not become a huge problem. I think all we really need to do is to hook the electric fence to where they are digging. We did this once and they didn't do it for a long time. So I guess that may be the solution.