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 of which have been highly successful in their own right. The films have in turn spawned eight video games and have led to the licensing of more than 400 additional "Harry Potter" products. The "Harry Potter" brand has been estimated to be worth as much as $25 billion. The great demand for Harry Potter books motivated "The New York Times" to create a separate best-seller list for children's literature in 2000, just before the release of "Harry Potter and the Goblet of Fire". By 24 June 2000, Rowling's novels had been on the list for 79 straight weeks; the first