I have a dog, too and have to admit I sometimes use her as an "emotions detector" - much like a guide dog, because I'm actually not that good at recognizing people's emotions/moods. The angles at which she puts her ears and head are pretty reliable and easy to read indicators. :) When she sees someone's upset or sad she'll walk over to them and cheer them up. Even random people in the street or on the subway. I mostly fail to even notice...