The dog - man's best friend. With these words, scientists agree. In the most recent study, they found that dogs can distinguish facial expression and his master, and strangers.
Dogs can be a subtle psychologists. Biologists were screened dogs images of faces with different emotions and recorded the response of the animals. Almost all dogs coped with the task. In 65-80% of cases Pets discern the emotions displayed on the pictures.
It is difficult to say whether this feature of the behavior of Pets congenital or acquired. This is a lot to learn in the near future.