Moo Dog is a sweet and surprisingly funny early reader about a bird and a dog who aren't like the other animals. This Level One reader is a follow-up to the sweet and funny Moo Bird in which Bird says "moo" instead of "tweet." In this book, Dog says "moo" instead of "woof!" The other animals laugh at Dog. They don't understand why he is different. Can friends Dog and Bird show the other animals that being different can be fun?