What puzzles you is why he's so obsessed with digging under the fence. It's not as though he's stuck in the house all day. While you're at work he has access to the yard and can roam and play outdoors to his heart's content.
You've even made an effort to stop him digging by shouting when you catch him in the act. However, for some reason, he enjoys defying you and digs with even more determination.
Unfortunately, what you failed to grasp was the dog was bored and frustrated, and digging provides an outlet for his energy. On top of that, when you shout at him the dog thought he was being encouraged rather than punished, and it made him more determined to dig, not less.
If you're now scratching your head wondering what can be done, then read on to find out.
Even the most determined digger will respond given time and patience. But if in the meantime you're worried about having an escapee on your hands, practical measures such as a buried fence or chicken wire will beef up security for your peace of mind.
To get going, you'll need:
Sammy is a digger as you can see. I tried everything and eventually even just tried keeping him on a leash, but the only way I was able to stop him from digging under my fence was to get a Pet Playgrounds DIY Dog Fence Kit which comes with a dig guard. I got it from petplaygrounds.com and even though he digs up my yard like crazy he can't dig under my fence.