re: electric fence or gps collar advice please

Electric fence works. Once they get hit a few times and figure out the danger is at the fence, you can turn the juice off. They will give the fence wide berth.

We are on 2 acres and our lab got popped pretty good smelling the wire. I saw the arc myself. For 5 years she stayed 10 feet from the fence and never went close to it without dropping her tail down.