Being an animagus?

[amycrn4230]

No: HPFGUIDX 94912

This is my first post, so hello all...


Here is my question...In the chat with JKR recently she says that a 
person who studies to be an animagus cannot choose what they are to 
become, and in the PoA, I got the impression that the boys picked 
their animals in order to be big enough to "control" the werewolf
(Remus)???...and my 2nd question is this...how did a stag fit in that 
tiny passageway to the shrieking shack? (p. 337 American Ed. "They 
moved as fast as they could, bent almost double...")

Thanks for letting me lurk...these discussions are most enlightening!

AmyC