Thank you for that information.
Since the dogs were not properly trained to the under wire fence they found that the shock did not really stop them from getting out just that it may have caused some discomfort for a brief second , but they could still get past that.
I can tell you that the hot wire usually works pretty well and one touch usually keeps dogs from going near it again. The wire itself works as a visual to the dog , unlike an underground fence, but also in the beginning, I tie a piece of plastic bag to the wire or put up surveyor flags near the wire as extra visual. I do believe that this can be attached to a chain link with the proper plastic conductors, if not you can put some small wooden stakes around the fence line and attach it to those with the conductors. Put it low enough to the ground that they will touch it if they go to dig or chew the fence. Walk them around it on a leash and when they get close to it take a long stick and hit the wire just a bit so it moves and tell them no. You want them to notice the wire. Make sure to stay and watch their reaction if they touch it. This is not something you want to just let them out to explore and then leave for work.
I think it would also be beneficial for you to train them daily. At that age a hour training session daily on a leash in the yard should be fine. You can also train a little in the home while you go about your business. When you train heel it is best to do it in a hallway where there are little distractions and not enough room for the dog to go anywhere else so she must stay near you in that respect. I'll direct you to a site to a site that will take you step by step in obedience training and to a site that will show you videos of how it is done.
Don't feed them before you train as you want them to be hungry. Use human food to keep their attention and make is small enough that they can suck it down in one gulp. Any treat that will take time to chew or that will crumble to the ground when chewed will take their attention off of you and you don't want that. Small hot dog pieces or chicken pieces work well.
` Clicker training