We travel in a travel trailer and love taking our small dog with us. Unfortunately he barks if left alone in the RV for even 5 minutes. He's walked, fed, and comfortable in the RV, just doesn't want to be separated. I really want to work on training him to stay alone in the RV, but am looking for advice to get him used to being alone for short periods of time. He's a 7 year old maltese mix and unfortunately has a very loud, high pitched bark. I don't want to disturb those camping around us.