Mozart, a cute little dog, has inherited a fortune. You'd think a heavenly dog's life was certain. But trouble threatens the little treasure, because the wicked Titus, disinherited by his deceased mother, has hatched a diabolical plan to get his hands on his mother's inheritance after all. Fortunately, Mozart has good friends in the four children Alexander, Robby, Hedwig and Lilly, who do everything they can to protect their four-legged friend from Titus' malice.