Ally Lancaster and The Enchanted Fortress

Ally Lancaster was an average eleven-year-old. Her parents were forcing her to go to a school she hated, so she came up with a plan to get herself expelled. But her plan took an unexpected turn when she came face-to-face with a real-life Dueling Dog - a massive black labrador with giant wings named Aristar. Ally and Aristar quickly become best friends, and it's up to them to save the world from the evil Zortavka and the many dangers that lie in wait for them in The Enchanted Fortress.