My bubby (in other words dog) Domino will bark at absolutly nothing.. We have the door open he'll just bark and nothing will be there. If you don't pet him he will scratch your arm and bark and other things until you do (ok thats cute but really annoying at times) Oats (quaker parrot) he sits there and screams... and screams... and screams. You tell him to shutup he gets louder, you yell at him and he says "Good Boy!" its like no not good boy.