just go about your business and leave, make no drama out of it, or do anything special as he may be reacting to this and knows he will get attention. when we only had Meg, she got her kong stuffed with treats and peanut butter, but only and only when we left her alone. we used to get it ready for her and you could tell she was thinking " hurry up and go, let me have my kong " then we could go out for a few hours no problem. now we have ollie as well, we cant do it as they might end up fighting over the kongs :-( . but anyway they both get a small biscuit each that they can eat quickly so no arguments and we just go out. as they have gotten older, they dont mind us going, and are still just as pleased to see us when we get back.