Santa's Little Helper of their sacrifices and starts treating him badly, causing him to run away. He ends up in the possession of Mr. Burns, who trains him to become a vicious attack dog. Several days later, Bart stumbles upon the trained Santa's Little Helper and is attacked, but the greyhound eventually recognizes his old friend and stops. In "The Canine Mutiny" (season eight, 1997), Bart uses a fake charge card to buy a well-trained rough collie named Laddie from a mail-order catalog. Laddie learns many tricks that Santa's Little Helper is completely unable to perform, and the Simpson family nearly forgets about
The Simpsons their original format. In July 2017, all episodes were made available for purchase on the iTunes Store, in the United States. The popularity of "The Simpsons" has made it a billion-dollar merchandising industry. The title family and supporting characters appear on everything from T-shirts to posters. "The Simpsons" has been used as a theme for special editions of well-known board games, including Clue, Scrabble, Monopoly, Operation, and The Game of Life, as well as the trivia games What Would Homer Do? and Simpsons "Jeopardy!". Several card games such as trump cards and The Simpsons Trading Card Game have also been