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 in translation 'R.A.S.', "svart" being Norwegian for 'black'; and in the Finnish edition the initials were R.A.M., 'musta' being Finnish for 'black'. Fans took this to mean that the character was Regulus Black, the brother of Sirius Black; when "Harry Potter and the Deathly Hallows" was published, this was revealed to be the case. Similarly, the title for "Harry Potter and the Order of the Phoenix" did not make it obvious whether the word "Order" referred to a group of people or to a directive. The information that it was a group of people was then determined by viewing the title in