We have a 3 year old Shiba Inu that loves to run. And rather than run around in his 1/2 acre fenced in yard, he's taken to jumping the fence to run around the neighborhood. 6 months ago we bought an electonic invisible fence in addition to the 4 foot high chain-link fence. That has worked until today. He jumped it even though the invisible fence is in working order and we can hear the collar beeping when he gets close to it. Any suggestions how we keep this dog in the yard??