I wouldn't trust them. Once they figure out the shock is only at a point and they want on the other side....
Not really worth it.
I thought about doing this a couple years ago but read that it is almost a joke. Plus I am not sure what to think about the kids/teens that cut across the yard if the dog is out...
We LOVE OURS
put mine in about 9 years ago,, female lab was easy to train and stays in the yard
although she will get out if the battery on her collar goes dead,, Male lab was another story ( he is a big boy, 120lbs) . had to buy the collar for hard to train dogs, damn thing takes a 9volt battery .. I put it on the highest settng and needless to say it literaly put him back on his ass*** and now he stays in the yard
anyway.. they work great but you do have to trian the dog with the flags. after several years you can get breaks in the wire that suck to trace down but it is possible
I have a SportDog brand underground fence. It took me forever to bury the thing....that being said, I did fence in 7 acres. All in all, I'm happy with it. I have a Great Dane and a Boxer. Both dogs respect the boundaries after a few training sessions. The SportDog brand has a variable shock level collar. It also runs on a regular 9v battery vs. the rechargeable kind that a lot of collars have. A buddy of mine has the same fence and it's worked well for him too.