Santa's Little Helper barrier, allowing the dog to understand Bart's commands, and consequently pass the obedience school. Santa's Little Helper has fathered several puppies. In "Two Dozen and One Greyhounds" (season six, 1995), he runs away to the dog racing track where he mates with a female hound named She's the Fastest. She later gives birth to 25 puppies and when the Simpsons cannot take care of them any longer, they decide to sell them; however, Mr. Burns steals the puppies and decides to make a tuxedo out of them. Before he does this, however, he becomes emotionally touched by them. This convinces
Bart's Dog Gets an "F" shorts, the characters spun off into their own half-hour prime-time show on the Fox network named "The Simpsons". Matt Groening, the series' creator, wanted Ullman to make a guest appearance in one of the shorts, but was told that she was too busy with the rest of "The Tracey Ullman Show". When her show was canceled in 1990, Ullman agreed to do a guest appearance on "The Simpsons" after being asked by Groening once again. The animal noises for the episode, including those by Santa's Little Helper, were performed by Frank Welker. It was the first "The Simpsons" episode Welker