Our dog starts to bark and act very hysterical when we stop the car and it's time to get out. He is very eager to get in to the car, but when we stop he is so excited that he must get out right away. It's very frustrating and we can't find a way to get rid of that behaviour. Any advice? We have tried to ignore it, wait until he stops (he sits down and is quiet for a second but goes on immediately after we give him permission to get out. Then he barks and runs around for a few minutes before he calms down).