Hamster and Dog are back to celebrate Hamster's birthday! Pink cake, blue cake, chocolate through-and-through cake. Short cake, tall cake, cannot-eat-it-all cake. WHICH WOULD YOU CHOOSE? Newbery Honor author Cynthia Lord and NEW YORK TIMES bestselling illustrator Derek Anderson return with a tale chock-full of fun rhymes and hilarious artwork about Hamster's favorite day: his birthday! But is it possible that Dog and his friends have forgotten all about it? Not a chance. Join them as they plan the best surprise birthday party ever!