Originally Posted by alexg
The 1st thing comes to my mind is to have a friend to imitate the delivery and to place the 'box' at the 'safe' distance and gradually coming closer to the door as she is progressing. Again, it will take some time and patience. Good luck.
This is what I'd do as well if my dog has that issue and I'll be standing inside treating or making it pleasant while my friend make fake deliveries outside. Or maybe you can gate off that area to the front entrance to see if that helps.