Sparky, that is awesome! I love Rotts they are so smart and very friendly. I have had two mixed Rott's and one passed at 13 and the other one is 8 and going strong. Now I have a pit bull mix who is as sweet as a lamb. Of course my dogs are a part of the family and sleep in the rooms with us so I think that has alot to do with their personality. That really is so neat that he taught himself to do that for you...Sue