Axel & Theo: My Dog Is the Emperor of a Faraway Galaxy — Amberly Kristen Clowe

Theodore Howard wants a white flag. The kind of white flag that will show Riverwood Elementarys biggest bully, Theos given up on ever surviving the fourth grade, and achieving his dream of becoming a real-life astronaut. But, Theos seemingly pathetic future gets a glimmer of hope in the form of a very talkative weenie dog named Axel. Theo learns that his best friend on four legs, is actually an alien from the planet Doglin, and just when he begins warming up to the idea of having an alien for a best friend, Axel is kidnapped by two cats from the planet Catlat. Theo chases after Axel and his kidnappers embarking on an adventure he could have never imagined.