Territorial dog stops guests from coming over

A family lived with a Belgian Malinois who turned the front door into a no-go zone. When guests arrived, he would launch, hard enough that even a trained visitor needed protective gear.

At the veterinarian's kennel, the same dog was calm, gentle, affectionate, and relaxed. The staff could hardly believe he was the dog they were warned about. How could this be?

Home was different. There, he acted like the house was his to run. Guests meant a threat to that setup, so he made a plan to stop them at the door. The family did what many dog parents do when love and fear collide: they stopped inviting anyone over. This was the same dog acting differently in two different situations.