I knew there were lots of stories of very smart yorkies......love them all! Tatiana is only 5 months and she already knows when it is time to go to sleep. When I go to bed Teeka and Tatiana are allowed to rough house for a few minutes on the bed. When I say, "its time for go to sleep" I turn the light off and she immediately goes to my pillow and lays down and Teeka goes under the covers and lays down! I think they understand what I say. All I have to say to Max to get him all excited is "Where's Alan" and he starts whining and looking for him!