toedtoes wrote:
There are two main issues with those eletronic fences:
1. Some dogs are willing to suffer a moment of pain in order to get through the fence line (and some are so headstrong that they don't notice the shock when they race through it); and
2. The fence does not keep other creatures from reaching your pet. Any loose dog can run at your dog while you believe your dog is safely secured.
My SIL had one of those and her dog figured out that by laying close enough to set off the tone, but not close enough to get the shock, all she had to do was wait until the tone stopped. With a dead battery in the collar she was free.