Hi,
Yes, mine does it. We've not got a mirror that he can see, but there is a glass that he can see his reflection in. It was so cute, the first time he saw himself he started growling and ran up and grabbed a toy that was close to the glass and came running back with it. Didn't want that other dog to get his toy. Just the other day we were in the car and we were stopped and parked so I was letting him hang his head out the window. He saw himself in the side mirror and started growling and doing this real low quiet ruff ruff type of bark. Such a goofy boy!
I don't live in an apartment or anything, so I think it's really cute.
Whitney