We had an English pointer that used to lunge at my mother's front door when strangers were on the porch. The door had 16 panes, the four on the bottom ended up replaced with extra strong glass because of this dog.

We were in the habit of shutting him in the upstairs stairwell when people came to the door, because of his barking and lunging. Two men, Jehovah's Witnesses, arrived, Mom opened the door, and when they indicated their business she declined to talk to them and closed the door. But one of them actually stuck his foot in the door to prevent her.

I walked over to the stairwell and let the dog out. They were gone in a flash.

SRS