Troublesome dog escapes from his walker into a garden of a retired magician. When dog runs away, boy timidly explains problem to magician, only to discover the (view spoiler)[dog has been turned into a duck. Or has it....? (hide spoiler)] 
 Since the ending is open for interpretation, this would be a great book to use in a lesson about inference. Also, artistic style is similar to VanAllsburg's other distinctive picture books.