Aravis, you're not going crazy. Well, I don't think you are.

I did seem to notice that she made a point of saying Crookshanks was there. Every time I think this through, I think that Crookshanks must be one of three things:

A.) Crookshanks is an Animagus watching over Harry.
B.) Crookshanks is an Animagus spying on Harry.
C.) Crookshanks is a cat and J.K. Rowling kept forgetting about it until scenes with Sirius, as Crookshanks is so well associated with Sirius from Prisoner of Azkaban.

This whole idea is driving me crazy, because none of those three things make too much sense. The first two I believe are very possible, though the second would be kind of like watching a repeat of a show. It'd be annoying if two pets out of three ended up to be traitors to their masters.

Can anyone else think of any possibilities? There must be more.