I set up my Dog Line fence system about 3 years ago and I have never been happier. I have upgraded the collars once and they keep getting better. I have 4 dogs ranging from a Jack Russell to a Ridgeback and German Shepherd. With very little training they all got the message. My dogs are safe and happy. I even made a loop around our veggie patch. As soon as they hear that beeping sound they know not to proceed. It's so simple. Took me hardly any time at all to set it up for an acre so my kids have all that space to run around on. Mind you, the postie gets a shock when all 4 dogs race towards him as he's delivering the mail, only to stop 1 meter away from the fence. It's funny to watch but rest assured, I have spoken with the postie and all is well. Cheaper than building new fences and I am a very grateful dog owner. Cheers Colin and team