(Encore episode) Clive Wynne, founding director of the Canine Science Collaboratory at Arizona State University, draws on studies from his lab and others around the world to explain what biology, neuroscience, and genetics reveal about dogs and love. He's the author of Dog Is Love: Why and How Your Dog Loves You. Follow host Maddie Sofia on Twitter @maddie_sofia. Email the show at shortwave@npr.org.