Dragonworld: The Legend Continues (1999)

In the remote Scottish Highlands, a place steeped in myth and mystery, there lives a boy wizard. His name is John McGowan and his only true friend is Yowler, the last dragon on Earth. But Yowler is in terrible danger. His arch enemy, the Dark Knight, has returned and is determined to slay the dragon so that he might use the magical powers of the creature's blood to unleash a new age of darkness on the planet. Only young John can save Yowler...and so begins the ultimate battle between good and evil.