The film centers arround Mark (Jones) and Fran (Pleshette) Garrison, whose pet dachshund Danke has given birth to three adorable puppies. As a reward for the occasion, the veterinarian (Ruggles) gives Mark a baby Great Dane who is the runt of its litter and is in need of nourishment. Mark decides to take care of it and assimilates it into the dachsie family. Soon, little Brutus grows to be a very big problem, inciting several comical disasters in and around the Garrison house and putting Mark's marriage into the doghouse, especially after Fran's big dinner party descends into total chaos. Nevertheless, Mark thinks Brutus has what it takes to become an obedience trial champion (and also wants to spite his wife).
The film was released alongside the Disney cartoon featurette Winnie the Pooh and the Honey Tree.
This film contains examples of:
- Angry Guard Dog: Brutus is very protective of the Garrison family, chasing several people over the course of the film an forcing them to climb in trees.
- Asian Speekee Engrish: "RION!"
- Bait-and-Switch: At the beginning, Mark and Fran are in a rush to get to the hospital for a birth. The mother in question is their female dachshund, Danke.
- Big Friendly Dog: Brutus, though he's very clumsy.
- Bitch in Sheep's Clothing: Danke's puppies are this, as they's smart enough to provoke Brutus and do whatever damage they want inside the house or during the party without ever getting suspected while Brutus always takes the blame.
- Canis Major: Brutus, compared to the dachshunds' size.
- Heroic Dog: Brutus, when he saves puppy Chloe from a garbage truck.
- Interspecies Adoption: Brutus is fed with Danke's milk as a puppy. By living in contact with dachshunds, he develops a habit of crawling on the floor to get closer to their size.
- Living Motion Detector: Mr. Toyama invokes this when he mistakes Brutus for a lion.
- Pet Contest: Mark enters Brutus in a Dog Show, where Brutus encounters a female Great Dane and promptly realizes how to finally be himself.