I was just going to make a thread on a fence like this. I dont know if it is the same one your talking about though. There is this other kind of fence that you dont have to dig into the ground or anything. This one you set the boundries too, except when your dog leaves the yard it keeps shocking them until they are back in the "safe area." We have a problem with our dog too and I was also wondering the pros and cons of these fences.
BTW welcome to PT!