Ok, heres my thoughts on Invisible Fences. My step-mom's dog is trained on an Invisible fence, and while he's pretty good about it, he has run through it on a few occasions, the collar has failed, and we have had to go find him in the neighborhood. Also the people who live down the street have a dog on an invisible fence and, he is in our yard harassing my dogs more often than he's in his own yard it seems. Would I try and train Indy on our Invisible fence? No. I don't trust it. I know if she saw something that she wanted she would run right though it. Either take your dog out on a leash, get a tie out, or break down and get a real fence.