I am so glad it worked out for the dog, you and your son. That dog is going to be a challenge.
I was once given a totally trained 3 yr old GWP years ago and she was a fence jumper. Once I got her hunting hard and often she calmed down. Off season would have her jumping but staying in neighborhood and coming back within an hour. I never left her alone outside which was a PITA. Very frustrating till she got older and couldn't jump the 5 1/2 ft fence. Had to be vigilant with doors being opened to outside. She would blow past you as you entered or left the house.
A digger may be easier to deal with after making the area secure with concrete along bottom of fence. ha ha.
