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 and the Philosopher's Stone family throughout the series, and in his treatment of first Rubeus Hagrid and later Remus Lupin and Sirius Black as father-figures. The second book, "Harry Potter and the Chamber of Secrets", was originally published in the UK on July 2, 1998 and later, in the US on June 2, 1999. "Harry Potter and the Prisoner of Azkaban" was then published a year later in the UK on July 8, 1999 and in the US on September 8, 1999. "Harry Potter and the Goblet of Fire" was published on 8 July 2000 at the same time by Bloomsbury and Scholastic. "Harry