When I leave to go on errands I usually put Shadow in his cage where he sleeps. It's really small and I always feel so bad that he doesn't have room to play so I decided to get him a pen. I got the 24" high one yesterday and put him in it, only to have him greet me at the door a few hours later. I couldn't believe he got out because he's not that big. I went back today and got the 30" one, sure that that would keep him in. Well, I put him in it and then went to the bathroom before I left. Not 2 minutes later he rounded the corner. So, I guess I'll try and get the 48" high one and see how that goes. I had no idea I had such a talented dog on my hands.