Thanks for your reply suggesting a dog run, however, I guess maybe my question was not clear enough. Nikko did just fine in our backyard for well over a year, (never trying to get out of the yard) he just recently started digging again. My question is, do dogs go through phases like humans do? Could Nikko be going through his teenage years? Rebelling? I guess that was what I was aiming more for. Sorry if I was a little unclear in my message before.

Thanks,