Harry Potter and the Prisoner of Azkaban attacked by a big black dog, which Harry has seen several times before. The dog drags Ron through a tunnel under the Whomping Willow into the Shrieking Shack. Harry and Hermione follow, and there is a brief standoff when they find Ron with Sirius Black, who has transformed from the dog. Lupin enters, and they explain the situation to Harry and his friends: Lupin is a werewolf, which led to his friends James Potter, Sirius Black, and Peter Pettigrew becoming animagi. Lupin explains that Scabbers is Pettigrew in his animal form; he has been hiding from Black, whom he had
Harry Potter fandom Harry Potter fandom "Harry Potter" fandom refers to the community of fans of the "Harry Potter" books and movies who participate in entertainment activities that revolve around the series, such as reading and writing fan fiction, creating and soliciting fan art, engaging in role-playing games, socializing on "Harry Potter"-based forums, and more. The fandom interacts online as well as offline through activities such as fan conventions, tours of iconic landmarks relevant to the books and production of the films, and parties held for the midnight release of each book and film. By the fourth "Harry Potter" book, the legions of