@Duke:
Thanks etzbseder…but try doing these exercises when he's over excited, focused on his agenda - the people at the door - chaos is the scene. He doesn't hear or even see me, I'm in his way. The method you describe works perfectly when training - which he is very good at and the treat is what he wants. I do think that the water bottle (at this point) is the only thing that distracts him for a nanosecond. Then he submits to the bottle, but remains anxious about the people at the door. It is my hope that I can eventually do without the bottle (when/if he gets it) and just treat as described. Something to look forward to - total calm.
You said in an ealier post that you have tried tethering. How did you reinforce calm behavior while on the tether?
I think etzbseder is right, and rewarding is the way to go but I would recommend combining tethering and rewards.
I would first practice with people that are in his home normally and are therefore less exciting to him. Place him on the tether. At first before you even start with someone coming to the door just work on rewarding him for sitting or laying down while on the tether. Practice walking away and coming back to him and only reward if he is in a sit or down. Once he is pretty good about staying calm while on the tether, have the person come to the door and either knock or ring the bell. If Duke is sitting and calm reward on your way to answer the door. When the person enters have them give Duke a treat if he is sitting or laying down. At first they may need to toss the treat to him if their approaching him is too exciting. You may even want to use a bed or blanket to help him learn that there is a place he should wait when people enter so you can work towards eliminating the tether.