Dr. Andrew Root's search for the canine soul began the day his eight-year-old son led the family in a moving Christian ritual at the burial service for Kirby, their beloved Golden Retriever. In the coming weeks, Root found himself wondering- What was this thing we'd experienced with this animal? Why did the loss hurt so poignantly? Why did his son's act seem so right in its sacramental feel? In The Grace of Dogs , Root draws on biology, history, theology,...