hahahaha I loved that stage. My Dexter never cared about his reflection but my Fletcher was hysterical. I had a large heavy mirror that was waiting to be hung so it was leaning against the wall for awhile. My fletcher walked by it all the time and then one day he noticed the other puppy! He would strut by the mirror checking the other puppy out. He would whine and paw at the mirror, try to go to the backside of it to see if the puppy was behind it. LOL
Those videos are too cute!!