Booker, also known as Officer Booker or Lieutenant Booker, is a dog in the Animal Crossing series. He works as a police officer in Animal Crossing and Animal Crossing: New Leaf, and as a guard in Animal Crossing: Wild World and Animal Crossing: City Folk; in all games, he operates the lost and found. He works alongside Copper in all games except New Leaf. His name comes from the word book, meaning to arrest someone.