Who is that dog in the mirror?

Since the first day that she got here, Jessie has stared at herself in the mirror. I clean my full length mirror off every day and she messes it up within minutes of me cleaning it off. It is the funniest thing I've every seen. She just stands there looking at herself. Then she'll look at me and then back at herself. She will also watch TV if there's a dog on the screen. It really holds her attention. She really is a beautiful dog. Her fur is so soft and shiny.