Alexandra Horowitz observes dogs for a living. Her research began more than two decades ago, studying dogs at play, and continues today at her Dog Cognition Lab at Barnard College. She is the author of Inside of a Dog: What Dogs See, Smell, and Know and three other books: On Looking; Being a Dog; and Our Dogs, Ourselves. She lives with her family of Homo sapiens, Canis familiaris, and Felis catus in New York City.