The fourth installment in the film series. Beethoven is loved by the kids of the family who own him despite their parents hating his sloppy behavior and threatening to send him off to obedience school. Meanwhile, the rich Sedgewick family own an identical Saint Bernard named Michelangelo who is well-loved by all and pampered though often neglected from being played with. In an incident, the two Saint Bernards wind up switching places and hilarity ensues when the different behavior of both dogs surprises their respective families.