Barking at the door - what is desirable and what is not?
So here is the situation. So I am chilling on the couch and Rex is laying next to me. When someone gets close to the door, he jumps up and goes half way across the room and makes a series of fast alerting barks. Maybe 10 in a row and repeats until I stop him.
Stopping him here means I get up and tell him no and put him in a down. I open the door. Once it is open, most of the time, he remains in a down and does not bark. Sometimes he breaks the down and approaches non threatening.
I am not sure what I should do. The thing is he does this maybe 10 times a day (3 of which are that someone is actually at the door and 7 someone approaching the door but passing by). A variant. I take Rex to work 3 times a week. The area I work in is the size of a apartment and there is a glass door to the outside. If someone approaches the door, he does the same but less intense than the house.
Trainer says whenever he does, crate him so he gets that it is not necessary. I tried the me going to door and checking so that I signal to him that it is under control, but this did not stop this ritual. Forget distracting him with a treat. When he is doing it, I am only being able to "interrupt" with a no and showing him that I am not happy. But he is looking at me as if he is not understanding why I am interrupting. And does it again with less intensity until I interrupt again.
It is not very cool to get startled whenever anyone comes at the door. Then again, they have protective instincts and I dont want to kill that. I wish I could just tell him its cool and he calms down.
Please let me know your thoughts and input...