Guard Dog Patrol System

The dog starts his rounds at the first station by the kennel. He simply walks up to the unit which uses facial recognition to see the dog has arrived at his post and dispenses a treat. He then proceeds to go to the rest of the stations on his rounds getting a treat each time he arrives at a post equipped with one of these treat dispensing devices.

So he takes a different path each time thus remaining un-predictable, a random pattern would be created, different for each round, and each unit could sound a high frequency dog whistle to let the pooch know which location on that path he's supposed to report to next.

In higher security situations where Russian spies or Trump might carry a listening device tuned to hear the whistle and know the dog is coming, you could use another method to steer the animal, such as a dog collar equipped to tap the left or right side of the dog's neck depending on where you wanted him to go.

When he gets to the last post on his rounds the device says "Good boy! and the dog goes back to his kennel until it's time for the next patrol.

IMPROVEMENT ON THIS IDEA:

Simply have a bunch of treat dispensers on random timers. The dog will just run around, Easter egg hunt style after memorizing the locations grabbing treats as they become available.

Now they're much cheaper, no fancy electronic systems and actually less predictable. The dog can come along at any time.

As a bonus, this might become a fun game for the dog. Happy workers do a better job be they canine or human.