Feeling that something is lacking in their lives, the family of suburbanite Charles Grodin adopts a stray St. Bernard puppy. The cute lite beast grows up to be the less-than-cute Beethoven, a sloppy, slobbery, oversized and extremely destructive animal. Beethoven also brings with him a lot of hidden baggage in the form of evil veterinarian Dean Jones, who'll stop at nothing to steal Beethoven for the purposes of his insidious lab experiment.