Amidst the chaotic, haunting images that have defined news coverage of Japan since the earthquake hit on March 11, a heartwarming scene emerged last week. A video captured a haggard dog standing guard and protecting an injured companion in the middle of a mutilated landscape, occasionally offering a comforting stroke of the paw. It took rescue workers an hour to convince the sentry to leave the ward. The injured dog was then taken to a clinic, the other to a shelter. The world was left with a heartening lesson: Sometimes a dog can be another dog's best friend, too.