However, here are some instances where Crookshanks is mentioned and plays a key role in the story:
* Chapter 3, "The Time-Turner": Crookshanks is first mentioned when Hermione brings him to Hogwarts.
* Chapter 5, "The Dementors": Crookshanks chases Scabbers (Peter Pettigrew in disguise) through the corridors of Hogwarts, foreshadowing his importance in later events.
* Chapter 11, "The Firebolt": Crookshanks's intense dislike for Scabbers is emphasized.
* Chapter 17, "Cat, Rat and Dog": Crookshanks's role in uncovering Scabbers' true identity is a pivotal moment in the book.
You can find these specific instances by searching for "Crookshanks" or "Scabbers" within your copy of Prisoner of Azkaban.
Keep in mind, Crookshanks appears in numerous other scenes throughout the book, particularly when Hermione is present.