Yep, the same thing happens to me when I. for example come home early from work and touch the door! Cody, (probably sleeping) will growl, bark and push his paw through the mail slot like he does to the poor, defeated mailman. Once, I must have taken him by such surprise, I jokingly stuck my hand through the mail slot and almost got nipped until he smelled me. When I walked in, Cody's head went down "Sorry Kar". itoo, feel very, very safe!