Some dogs are built this way. I have shih tzu's and while they don't dig in the yard, its not an average normal inborn behavior for them, they do dig while trying to create a little place to lay in, like on a pillow or the couch.
Your dog prob. has digging in his personality. I put bricks at the edge of low spots where mine might escape when they are allowed to run around in the yard. Be sure and keep plenty of toys for him to keep him busy, but he might even bury them!
I know this sounds like what the heck, but dogs that are born to have alot of energy really do need to have controlled exercise to get this over energy out. Put him on a leash and take him either for a good run or a brisk walk for at least 20 min. The bigger the dog, the more energy he will have that turns into negative energy where they get into trouble. :)
Research the dog whisperer online Cesar Milan. :)
at 11:36 AM on May. 18, 2009