Mark and Leslie Graham with Hartlyn, a black Labrador puppy they are training for Guide Dogs for the Blind, at their home in Danville, Calif. on Tuesday,
Mark and Leslie Graham with Hartlyn, a black Labrador puppy they are training for Guide Dogs for the Blind, at their home in Danville, Calif. on Tuesday, Dec. 3, 2013. (Jim Stevens/Bay Area News Group) (JIM STEVENS)