Thanks for your replies, we have spent close to $10000 building the house yard fence which is post and rail chicken wire was secure until he started digging under it. Alpha bet I did state there was house fence and obviously I have tried making it secure as possible! But was actually after constructive ideas that I may not have already thought of!! And have installed the collar electric wire which then didn't work. The neighbours dogs wander the neighbourhood freely including our place but have a mate and are not puppies therefore don't. Really cause as much problem so the neighbours would only be setting up a future of disharmonious neighbours if they were to call te ranger I have thought of the electric tape and will look into it but was more reluctant to go down that path as the house yard fence is also for the children and yes they will learn from it to but it can be dangerous to young children unlikely but possible hence my looking for any advice I hadn't though that of yet. He does also have a paddle pool and sand pit. The problem became worse when my older dog passed suddenly he had no mate.
Sheena perhaps this lower electric fence would work on the outside of the fence he would still get a shock trying to go under but kids wouldn't accidentally touch it from inside the (not so) secure