At the age of 36, Caroline Knapp, author of the acclaimed bestseller Drinking:A Love Story, found herself confronted with a monumental task: redefining her world. She had faced the loss of both her parents, given up a twenty-year relationship with alcohol, and, as she writes, "I was wandering around in a haze of uncertainty, blinking up at the biggest questions: Who am I without parents and without alcohol? How to form attachments, and where to find comfort, in the face of such daunting vulnerability?" An answer materialized in the most unlikely form: that of a dog. Eighteen months to the day after she quit drinking, Knapp stumbled upon an eight-week-old puppy at a local animal shelter, took her home, and named her Lucille. Now two years old, Lucille has become a central force in Knapp's life: "In her," she writes, "I have found solace, joy, a bridge to the world."Caroline Knapp has been celebrated as much for her fresh insight into emotional and...