Both of my children have invisible fencing for their dogs, and it works. It's simplicity itself to install. It is made by Radio Corp. and just the other day I saw it at Home Depot for $80. In our area having it installed can run up to $700 so that is quite a bargain. We did buy one kit about a year ago from Damark for $99. We also found that after the initial training of the dog that just putting on the collar will keep them in bounds without even turning on the system.