Anti-escape fences

How the system works
A radio signal is transmitted over a buried wire (or wirelessly), marking out the perimeter you want for your dog. Your dog wears a receiver collar that detects the signal at the boundary. As your dog approaches the boundary, the receiver beeps as a warning. If your dog moves any further, he receives a harmless static stimulation. This stimulation will not hurt him but will convince him to stay within the escape-proof zone you have established.