What do we really mean by the ‘language’ of animals?

The reality of animal communication (or, more precisely, our belief in that reality) is a fact underwritten not by science but by direct experience. A dog owner knows that his dog communicates with him because he makes eye contact with it, notices its body movements, listens to its barks and whines and yips, and associates all of these actions with the contexts in which they occur and the actions that take place before and after such ‘signals’ have been sent.