My sister has eight Siberian huskies that climb as well as dig. They were simply uncontainable before she put up electric wires at the top and bottom of the fence. Now none of them even try to get out.

I do not like "invisible" fences, for a couple of reasons. First and foremost, your dog wearing the collar may (or may not!!!) stay inside the "fence" ... but to all the other dog roaming free, the "fence" means nothing since they don't have the collar on. Those dogs might be aggresive, sick, carrying parasites, etc. Around here, too, we have rabid wildlife. Scary. Also, a lot of dogs simply learn to ignore the "fence" anyway, I've seen it happen ... especially if they see a cat or a rabbit running by. Plus, batteries go dead, etc. A real fence is SO much more secure.