By reading your face.
And someone spent lots of $ trying to determine this? Just ask any dog owner and they could tell you without all the fuss.
Anyhow, read the story @ Report Some Dogs Know When Humans Are Happy Mad
and this:
Dog walks nearly 20 blocks to see owner with cancer in hospital @ Dog walks nearly 20 blocks to see owner with cancer in hospital
And someone spent lots of $ trying to determine this? Just ask any dog owner and they could tell you without all the fuss.
Anyhow, read the story @ Report Some Dogs Know When Humans Are Happy Mad
and this:
![B9qFxGzCIAAvp7s.jpg](https://pbs.twimg.com/media/B9qFxGzCIAAvp7s.jpg)
Dog walks nearly 20 blocks to see owner with cancer in hospital @ Dog walks nearly 20 blocks to see owner with cancer in hospital