Mirror, mirror

This morning me and one of the humans went for another of our semi-regular big walks, and I saw something that totally freaked me out. There was a big square thing against a tree--and there was a dog in it that looked just like me! And a human that looked just like mine! But when I got closer it didn't smell like a dog. I looked around the entire thing--no dog. No human. Nothing. It was so weird.