Following in the wake of Rascal and sporting some of the same appeal of humor plus sentiment, Goodbye, Kate introduces a new animal heroine. Kate is a homeless mule that Isaac finds wandering about the Kentucky hills one summer. Isaac and his father have much sly fun pretending that Kate is a ""thinking mule"" but, as the reader quickly learns, Kate's ""thinking"" is mainly ascribed to her by her new owner, Isaac. Her perspicacity becomes the object of several bets, during the outcome of which she shines with canniness. Although once jailed for vandalism, Kate comports herself heroically during a flash flood and is put out to pasture for her last days. Kate dies with her head in Isaac's lap. Clever with incident, the book makes good entertainment with some heart.