FOUR-LEGGED OFFICER is the first interactive chapter book application from the Straight From a K-9’s Muzzle series. The application is for readers of all ages, especially for those who like dogs and want to learn about K-9 police officers. Shadow, a German shepherd K-9, tells his story of how his breed of dogs came to exist, what it takes to become a specially-trained officer, where he came from and how he ended up in the United States, and what his job is like. Boys and girls will enjoy not only animating Shadow to move, bark, talk, and catch suspects, but also watching many eye-catching 3D animations. The application offers navigation and narration options in a new, clear-cut page design. This application aims to entice kids to read, or be read to, and to have a lot of fun learning many facts about dogs and their special abilities.