The mimicry of a human face helps to express more precisely the emotions, that is the direct relation to the events which is not connected with its intellectual judgment. At animals the mimic muscles are developed more weakly, but are not absent completely.
Training in reading a mimicry at the person happens during all life. Certainly, for the early childhood the most intensive assimilation of values of any given mimic signs is necessary.
People are differently capable to catch the emotions expressed on the faces of their interlocutors or opponents. It is complicated also by the fact that the person is capable to lie the same as language lies.
Some are capable to understand also emotions of animals though this "art" is given much more difficultly.
Mimicry of animals
The muscles which are responsible for a facial expression developed and became complicated at the person together with a speech development, and remained with dogs and cats at the same level on what were several millions years ago. The highest primacies are closer to the person on an evolutionary ladder therefore also the mimicry is much more difficult and more various than them, than a mimicry of representatives of families cat's and canine. However it does not mean that animals use the mimic device somehow differently. The emotions experienced by them also distinctly affect expression of their muzzle. Just people are not always attentive to these external manifestations of internal state of pets. Most often people are capable to distinguish only those mimic grimaces which can designate threat from an animal. Therefore the aggressive grin is practically well familiar to all. If the emotion of the animal person directly does not concern, then as it imprints in his eyes, to him, as a rule, indifferently.
How to understand what endures an animal
People who like to communicate with animals perfectly understand language of their mimicry. In many cases it replaces with it the speech. Having learned to speak, the person ceased to use some mimic figures which became possible to replace with words. Animals always show the gratitude, pleasure, confusion in a mimicry. To learn to read them to emotion, it is necessary just to be attentive to their internal state.
Having learned to understand a mimicry of animals, it is possible to come with them into such close contact which, apparently, is impossible without use of the speech.
However the fact that the mimicry of animals never deceives does this contact especially confidential. It is possible for this reason many people say that much more people love dogs. Though the animal also cannot explain you in accuracy the desires or tell about antecedents events, but their emotional state can always be determined by a sad or happy muzzle.