"Vivienne Parry, a former presenter of Tomorrow's World, suggested a cancer that starts in foxes but can be transmitted to humans. Dogs, she suggested, would cease to be man's best friend and instead become man's worst enemy because the cancer would be transmitted through them. Foxes would bite the dogs, transmitting the cancer to them, and they would bite their human owners. She said that were all dogs to be destroyed as soon as people realised they were passing on an untreatable cancer the end of the world for humans could be postponed. But she suspects man's love of his canine companions would seal his fate because putting down every dog would be too much to ask."