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 influences and analogues Harry Potter influences and analogues Writer J. K. Rowling cites several writers as influences in her creation of her bestselling "Harry Potter" series. Writers, journalists and critics have noted that the books also have a number of analogues; a wide range of literature, both classical and modern, which Rowling has not openly cited as influences. This article is divided into three sections. The first section lists those authors and books which Rowling has suggested as possible influences on "Harry Potter". The second section deals with those books which Rowling has cited as favourites without mentioning possible influences. The third section