SAPPORO, Japan – Retirement can be a death knell for guide dogs, creatures who spend their lives caring for others, but a home in Japan is giving these canines a new lease on life in their twilight years. The Sapporo Retirement Home for Dogs, in the northern island of Hokkaido, has sheltered more than 200 animals since it opened in 1978, giving them the best possible care until they are either adopted by sighted humans or die.