Why fence and window barking gets worse over time, and what to do about it. Covers the reinforcement cycle behind it, how to reduce rehearsal, and how threshold work shifts the response.
Territorial barking is triggered by anything your dog reads as approaching the home. Windows, fences, and the front door are where it plays out: people walking past, cyclists, delivery vans, other dogs. The dog's aim is to drive the perceived threat away. If your dog barks at you for attention or reacts to other dogs on walks, those are separate patterns with different causes.
Every time your dog barks at the boundary, the perceived threat eventually moves on. Your dog concludes they drove it off. That pattern repeats dozens of times a week. Territorial barking has a near-perfect reinforcement rate, which is why it deepens faster than most barking problems.
Unsupervised access to windows and fences gives your dog dozens of practice reps a day. Each one reinforces the habit. Reducing that access is the fastest change you can make: block sightlines, use baby gates, or keep your dog away from boundary spots when triggers are predictable. Fewer repetitions slow the habit while you work on the rest.
Shouting "quiet" from across the room usually arrives too late and can read as joining in. Your dog is already too aroused to take anything in. Letting the barking run its course is more rehearsal. Neither response reduces the habit.
Find the distance at which your dog can see or hear a trigger without erupting. That's your working distance. Working at the boundary of the home gives you more control than most outdoor environments: you can choose when and from how far triggers approach, and set up practice at the level your dog can handle.
When a trigger appears at your working distance, reward your dog the moment they notice it without reacting. Mark that moment with a "yes" or a click, then treat. Keep the exposure brief and end it while your dog is still calm. As the response stabilises, close the distance gradually over multiple sessions.
Access management reduces how often territorial barking happens. Threshold work changes how your dog responds at the boundary. Both need to run in parallel. Running one without the other means either the response stays unchanged, or your dog rehearses the habit between sessions.