The Simpsons Episode 8.20 The Canine Mutiny

After a computer mix-up, Santa's Little Helper gets his own credit card, which Bart uses to buy tons of expensive gadgets and gifts from catalogs. One of his many purchases is Laddie, a supremely bred dog that can do tricks, save lives, and use a toilet. The Simpson family falls madly in love with their new dog, nearly forgetting all about Santa's Little Helper, who can barely stand up, much less do a back flip (one of Laddie's many uncanny skills). When the credit card company gets wind of Bart's fraudulent purchases, however, repo men take back everything he bought, including the amazing new pet. In an act of extreme disloyalty, Bart convinces them to take Santa's Little Helper instead. At first no one really notices that Santa's Little Helper is gone, but Bart grows bored with his perfect new dog. He gives Laddie to Chief Wiggum and searches all over town for Santa's Little Helper. He finally finds his old pet serving as a seeing-eye dog for a blind man. Bart tries to steal Santa's Little Helper back, but the blind man catches him and turn him over to the police. When the police arrive with Laddie, the miracle dog sniffs the blind man and finds a stash of marijuana. Bart and Santa's Little Helper are allowed to go home while the cops detain the blind man and sample his goods.