I have a dog that is a digger, and I couldn't keep him inside our chain link fence. We bought the underground fence and it worked for about a week. Echo learned that he could wear the battery down by laying close enough to beep, but not shock, and then when the beeping stopped, he was able to dig out. We had to invest in a wire shock fence, one that when he touched it he got shocked. The only thing that I have found that works for him. But he is also a runner, once he is out you can't catch him for hours. ( have I mentioned that he is the spawn of Satan?) my other dogs are obedient.