Yes, climbing would worry me, too.
We have that small area now, the one that Ds put around the porch area when Hira got here. I am not sure that they cannot go over or under it, or even through, for that matter. So, they must still be accompanied. But, while we always leash Hira, sometimes they go together now, and Krypto can go out with them unleashes sometimes. This is the first time in his life.
My goal is to get that larger dog area fenced in the back. I still won't just let them out alone, but it would be nice to have a play area, and no-leash area.
Why, thank you! Yes, you have met some very nice people. I'm so glad! :-)
Love All Life; Thank You For Posting! :)