What difference can a dog make? I was about to find out. For two decades, my life was a cesspool of codependency. Fear consumed me. Life wasn't worth living. I'd "rescued" the two addicts in my life-one an alcoholic, another a crack addict. Then a puppy I'd foolishly gifted to my crack addict became "my" puppy when I learned it was destined to be traded for crack. I wholeheartedly resented the puppy because the damned thing was always happy, and...