Smacking the Door, Smacking the Door! Meuw, Meuw...

It is getting closer, a week or so now, until Angus an Stilton will meet, strictly under parental supervision at first.  Stilt is clearly getting a little fed up being stuck in the kitchen.  He is taking now to smacking the accordion door we installed, "meuwing" all the while.  Angus creeps up and peers under the door where there is an inch or so opening.  He growls/hisses/spits.  The "meuws" instantly stop!  Poor Stilty...