Stop your dog from barking at the window or door
Applying a glass obscuring film is an easy way to prevent your dog from barking at a window or glazed door.
For it to work, the whole area of glass your dog can see through needs to be frosted or covered. You therefore don't necessarely need to cover the whole pane, just up to a height at which your dog can no longer see out. Test by taping newspapers to the glass first.