Boy, never a dull moment at your house, eh?

I think it has to be Dudley the duck! Pouncer looks too confused, and the tail straight up in the air is a dead giveaway to his innocence. Allen is much too sweet to be causing such havoc, so that means it's got to be Dudley - by default.

Dudley - in the computer room - with the chair....according to the clues I'm getting.