S3E19: Dog of Death

In "The Simpsons" Season 3, Episode 19, titled "Dog of Death," things start to get tense when Santa's Little Helper, the family dog, needs an expensive operation. The family tightens their belts to cover the cost, leading to some amusing cutbacks on their usual indulgences. After the surgery, everyone's a bit resentful due to the sacrifices they made. Santa's Little Helper, picking up on the tension, runs away. He's eventually captured by Mr. Burns, who trains him to be a fierce guard dog. The episode wraps up with Bart and Homer infiltrating Burns' mansion to rescue Santa's Little Helper. In a heartwarming twist, the dog remembers his affection for Bart and turns against Burns. They escape together, and all is forgiven at home, restoring peace to the Simpson household.