I put in Invisible Fence to keep my pit bull in the yard (and the catahoula hadn't tried it yet, but we know she could jump the fence if she tried). PB Cinnamon would go out over the chain links but under the top rail at places where there weren't enough wires twisted to keep the links against the top bar. I thought I'd fixed that but she was still getting out, just wanting to visit and explore. I put this Invisible Fence in before I understood about walking them every day, but it is still good because it keeps them away from the fence and there are several places in the far back yard where people could approach the fence and grab one of the dogs (they are stolen too often around here). I also don't want the dogs to accidentally scare the little kids who visit their grandparents next door. Invisible Fence was expensive but it works very well. But it is a system meant for a yard where the dog spends all of its time, probably not so helpful for a casual visitor unless he's back regularly and is trained to the collar and the boundary in both places.

There are other training systems, most with a shock collar, that you can use to train the dog. Best to use it with flags to give them a clue as to the boundaries.

SRS