Not sure this here deserves a whole thread, but, my (very abused) rescue dog was total grouch when we first adopted him, total gangsta, and it was long time before he stopped glaring at us, (we just laffed, tossed bits of meat to him, and kept insisting *we* were not guilty---Buddy eventually did agree. He now loves us to bits.) <--------and it was another long time until we ever saw him smile for the first time. Buddy now smiles appropriately, such as whenever he is busy, big smiles all around.... but no one would ever accuse him of being super happy go lucky kind of dog. Buddy doesn't even smile when we say "Go for a walk" or show him new toys, or prepare his dinner, etc etc., the way some dogs do. He is just not a real smiley dog. Athough Buddy loves to goof around, and can be total fool for a new squeak toy, ----------he has a more somber default expression, sort of like a mortgage officer... so, i captured a smile, clicked, and treated it, whenever i could catch him smiling. I later added in the word "smile?" and he now can smile on cue, too. Whenever i catch him smiling, i stop whatever i am doing, and heavily praise him and lavish att'n on him. Rewarding smiles, has sooooooooooo increased his smiling. I can't even tell you how different he seems! I know for humans, if WE smile, our inner feelings can shift a bit. (try it, smile all the way to an appt you are dreading, you actually DO feel a bit better from the smiling). but i have no idea if this is also true of dogs....but, surely no harm done, either. At any rate, this sudden smiliness in Buddy greatly amuses us all!!! And Buddy seems to be soooo enjoying 'playing' us with his newfound skill, as well as all the att'n and praise just for smiling....Buddy just can't get over it, and seems to continue exploring the powers of his new smiles...... Probably marvels to himself, "All this fuss and love for just smiling?" I also started acting like i didn't understand he wanted to go for a walk unless he smiled at me. Ha ha, NOW he often comes up to me, and smiles this big goofy smile, to see if he will just get lotsa loves, or an actual walk. anyway, i thought the end result of rewarding smiles in my fairly serious-faced dog, was very interesting.