Funny you mention the sad eyes. I have a crazy little mutt that is possibly part Border Collie - she has the white-tipped tail, speckley toes, and she absolutely behaves like a herder. We always comment on how she has a "sad face" even when she's not in one of her neurotic moods. Our other mutt looks and behaves like a shrunken Golden Retriever, and he has a "happy face." It does seem to be the eyes. This is one of the happiest-looking photos we've ever gotten of the neurotic one. Husband took it after a hike. Names, for the record: Soda Pop (left) and Healey (right).