He's sad because one of the big kids in his class called him a "Murder Baby."
It's not sad because he's lonely, it's sad because he cropped out his family.
It's sad until you find out he loves doing this--then it's really sad.
He changes from happy to sad so often we think he's bipolar.
If this doesn't break your heart, you have no soul (or are the person whose slippers he ate).
The only thing is he has rabies, so don't share a bottle with him.