I set a couple of small squirrel squeaky toys in the window sill. When the dog came back from some venture she, of course, noticed their placement. That could not be tolerated so she immediately tossed them to the floor and promptly ignored them.
Some time later she ventured upstairs and I placed the toys back where I'd placed them before. Upon her return she immediately noticed that they were back in their spots on the sill. This freaked her out, she slowly approached them in a crouch with a low growl, ready to fight or flee if they should attack. When she got the toys back on the floor, where they belonged, and without incident, she could relax.