We had a mirror that our dog walked by every day, one day because of a surgery she was wearing a t-shirt to help prevent her from bothering the surgery site. F

We had a mirror that our dog walked by every day, one day because of a surgery she was wearing a t-shirt to help prevent her from bothering the surgery site. First time she walked by the mirror she startled, realized she was wearing a t-shirt, and walked off. Similarly when she walked by and we wave she immediately snaps her hear around to look at us. Certainly seems like she understands mirrors and never treated a dog in the mirror as anything but herself.