Is it possible for humans to discover the key to happiness through a bigger-than-life, bad-boy dog? Just ask the Grogans. John and Jenny were just beginning their life together. They were young and in love, with not a care in the world. Then they brought home Marley, a wiggly yellow furball of a puppy. Life would never be the same. Marley grew into a barreling, ninety-seven-pound streamroller of a Labrador retriever. He crashed through...