After Santa's Little Helper fails to save Homer in a fire,he plans to get rid of the dog but after a journalist sees Santa's Little Helper play with a beer can he becomes the new mascot of Duff Beer - and,given his new fame,his original owner claims him back. A publicity stunt is arranged at the beach whereby Santa's Little Helper will save Homer from a shark but again he fails so the shark is made the new Duff mascot instead. The owner now wants rid of the dog so the Simpsons take him back.
—don @ minifie-1