I have two German Shepherds (11 and 10). The delivery drivers that know the dogs, love them. The other drivers fear them.
The Amazon driver will often leave two treats on our packages if we aren't there to answer the door.
I walk them 3 times a day and the neighbours consider that our "Neighbourhood Watch"
I love that breed. They're so incredibly smart and I can see how they would make strangers take notice. That's so cool that the Amazon drivers leave treats for them. Once a dog person, always a dog person. : ) I'm sure they're the best security system (and also the best friends) you could possibly have.
They are exactly the security system I want. If you don't know them, you wouldn't dare open the door. If you know them, you know that you can walk right in.
That's what I call intelligent security. Those dogs are probably smarter than most people.