Didn't expect it to work, but it did
I was skeptical about this working, but it did. My dog used to bark at the door constantlywhen he wanted to come in. When I first got it, I pointed it at him through the door and he went running into the yard. Ever since, he rarely barks at the door in the annoying way he used to. Now he is morepatient and will wait for us to get there with one scratch or two. :)