I love seeing dogs smile. It is so cute! My Yorkie, Prissy, the one who smiles ALL the time, will even smile at my other Yorkie Peanut. She bounces all around him and jumps on him just trying to get him to play. She will extend her paw out and pat him on the head like she is trying to get his attention! He is so grouchy and grumpy the majority of the time that he does not want to play or be messed with. His response to her is growling but this only makes her bother him even more. He will growl his meanest growl and she will get all up in his face and smile her biggest smile at him. I wish I could read his mind or wish he could talk because I'm pretty sure he is cussing her out! It is so funny! Love watching them together.