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
Politics in The Simpsons to "hundreds of radical right-wing messages inserted into every show by creator Matt Groening". More recently, however, conservative bloggers and commentators have enthusiastically promoted cultural memes from the series, such as Groundskeeper Willie's derisive term for the French, "cheese-eating surrender monkeys". Political topics addressed on "The Simpsons" include homophobia and gay marriage (in the episodes "Homer's Phobia" and "There's Something About Marrying"), immigration and border control (“Much Apu About Nothing,” “Midnight Rx”, “Coming to Homerica”), drug and alcohol abuse ("Brother's Little Helper", "Weekend at Burnsie's", "Smoke on the Daughter", "Homer vs. the Eighteenth Amendment", "Duffless", "E-I-E-I-(Annoyed Grunt)", and "Days of