Dear Professor Dumbledore.
I really do not know how this happened.
A Cave Troll? How exactly did it get into the castle? They are not even native to this area, where would it come from? (The Forbidden Forest perhaps?) I require blue prints to the entire dungeons to find out how this happened, and prevent this occurrence from ever happening again.
A dog is acceptable in the castle, (though I do not recall seeing it on the list of pets the student could bring) but Cave Trolls have no value at all when it come to the faithful companionship that a pet provides.
I would also like to set up a meeting with Professor Quirrell, to discuss how the castles defense against dark creature such as the Cave Troll can be fortified, so that a incident like this can be avoided.
By the way, did you ever hire a speech therapist as I suggested? If you have not, perhaps you should hire him a therapist who specializes in confidence building as well, because it looks poorly on your school when your Defense against the Dark Arts teacher feints at the first sign of trouble. Not that I have anything against the man, it's just that, well, have you ever been in the same room with him? The smell of garlic, Dear Merlin! Does he really think that a vampire is going to get past all of the schools defenses and attack him?
I really would like those blue prints. Maybe what the school needs is to train all of the suits of armor in the art of battle.
Hope you had a wonderful Halloween.
Cygnus Stixrood, Chief Centennial Inspector, Department For Permits And Filing.