Anyway, the fence does its job most of the time. But when there’s something _terribly_ tempting on the other side of the fence, like some dogs playing down the beach, or a squirrel that, collarless, sprints into the next yard, well, the dog just goes for it. She runs right through the warning bell, through the shock zone, twitching all the while, and bursts out the other side, liberated from her cybercage.