Santa's Little Helper and is the center of the plots of several episodes. During the course of the show, he has fathered litters of puppies, passed obedience school, had surgery for bloat, replaced Duffman as the mascot for Duff Beer, and been trained as a police dog at Springfield's Animal Police Academy. Some of the episodes that focus on Santa's Little Helper have been inspired by popular culture or real experiences that staff members of the show have gone through. Although cartoon animals are often anthropomorphized, Santa's Little Helper generally exhibits canine behavior. Cast member Dan Castellaneta currently provides the dog's sounds on
Religion in The Simpsons praying. William Romanowski, author of the book "Pop Culture Wars: Religion and the Role of Entertainment in American Life", noted that ""The Simpsons" is not dismissive of faith, but treats religion as an integral part of American life. Episodes that I’ve seen are not so much irreverent toward religion, but poke fun at American attitudes and practices." One episode that heavily features religion is "Bart Sells His Soul" (1995). While discussing "The Simpsons" treatment of religion in his "Drawn to Television" book, M. Keith Booker cites a scene from the episode where Milhouse asks Bart what religions have to gain