The Simpsons (1989)

S37E14 Irrational Treasure

Marge's mission to improve the family's dog, Santa's Little Helper, takes an exciting turn when she decides to enter him in agility competitions, culminating in a trip to the National Dog Show in Philadelphia. While there, Marge and Homer unexpectedly find themselves entangled in a thrilling historical conspiracy, reminiscent of a "National Treasure" film, alongside their beloved pup.