Back in the early 1990s, my dog squad (one male Doberman and one female Pitbull) had an interesting encounter with an intruder. They had their own doggy door from the house into the fenced in backyard. The gate to the yard was locked. The electrician decided to come a day early, because he happened to be in the neighborhood, to install the new pool heater. He rang the doorbell and found out no one was home, but heard and saw that the dogs were secured in the house, so he figured it was OK to go into the backyard to do his work. He found the gate locked tight, so he climbed it. The dogs saw him, however, through the sliding glass door, stormed through the doggy door, and ran to him at top speed. The Pitbull grabbed his pants and started pulling him to the ground. The Doberman was the leader, however, and hadn't yet decided that violence was called for, so he grabbed the Pitbull by the collar and dragged her off. The electrician figured that was his cue to leave, but when he started for the fence, both dogs charged him again, and the Pitbull again grabbed his pants, but the Doberman again grabbed her collar and dragged her away, making his point more forcefully this time, getting between the Pitbull and the man, not letting her near him. The Pitbull now decided to keep her distance and stay out of it. The man once again figured that was his cue to make for the fence, but the Doberman wouldn't have any of that. He ran in front of him and blocked his path with a very serous and guttural growl while baring his teeth. He wanted him to stay put till the humans arrived home, but the man started taking small backwards steps to make gradually for the other side of the yard, eventually, after a long while, making his way to the fence and then a quick jump for it and over.
He reported in detail those events to us the next day when he showed up for his scheduled appointment.
