Baymule
Herd Master
We have a Great Pyrenees, Paris, that rivals a John Deere excavator for digging. Hot. Wire. Top and bottom.
I don't think you can put hotwire underground... An electric fence, yes, but they have to wear a shock collar. Correct me if I'm wrong.For our hen house we buried a foot of fencing underground just for extra protection against coyotes. Some hog wire underground may help depending on how far your dog is willing to dig to get out.
Hope this helps!
Madelyn