I got two Weims and they are a handfull. I have an actual fence that I keep them in. They figured out how to unlatch the fence so I locked it. They figured out how to open the divider betweent the gates and push open the locked gate, so I DOUBLE locked it. Then they dug a hole underneath it. So I buried chicken wire, and wired it to the fence. They broke through the chicken wire so I heated and bent rebar and drove it about 3 feet into the ground and attached it to the fence, but they kept digging. So I got an electric fence to put around the actual steel fence to prevent problems. It works, sort of. If I forget to turn it on, they get out, if I dont then they stay in. BUT.........they will run through the electric fence if the gate is open. I guess the prize is worth the punishment. I dont know, I wouldnt trust it in an open yard, at least not for my dogs. But the neighbor has it too and she has had 4 dogs on it and they never get out. (BTW....I put the 9volt stubborn dog collars on my dogs, and they still run through)