Looking around today for my response and found some fun ones, but when I visited some neighbors and their dogs with a mirror and some treats we had a blast. This is Chloe and she is always ready for a treat.  Here she was hesitating because of her reflection.   Her focus on the treat was fixed and nothing was going to make her look away except in the very beginning.  It seemed that her own reflection was just enough of a distraction, a hesitation to capture her reflection.  Not much time once the treat was dropped after that though.