Help! I am working with Cody to have him act CALMLY when the doorbell rings. Currently, he runs down the stairs, barking, whining, anticipating whoever is at the door. He thinks everyone is there to greet HIM! When someone does come in, he is all over them. No amount of training so far has worked! I ask people to not pet him, and to ignore him but he is persistent. After 10 minutes, he's over it and is calm. He knows how to sit, go down, wait, stay (for no more than a minute), but when the doorbell rings, he is not interested in treats, only getting to the guest. Any ideas?