 because he's already been through this so many different times. As a behaviorist studying for as many years as I've studied, the concept is that dogs learn through associative behavior. If the dog has associated in the past with previous people he lived with leaving and not coming back or abandoning him or dropping him off at a shelter or wherever they did with him, morons that they are. The bottom line is this dog is now going to feel that every time you leave, you are not coming back. That's entirely different