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
Magical objects in Harry Potter his grandmother, stating that he ignored it and that the result was horrible. Subsequently, Neville receives another Howler from his grandmother after Sirius Black uses his list of passwords to enter the Gryffindor Common Room in "Harry Potter and the Prisoner of Azkaban". Hermione receives one in "Harry Potter and the Goblet of Fire" after Rita Skeeter publishes an article about the (fictional) relationship between Hermione and Harry. (In the film version, this incident is not referred to.) Dumbledore sends Harry's aunt, Petunia Dursley, a Howler in "Harry Potter and the Order of the Phoenix" to remind her of the