As funny as it sounds, dogs sniff each other back there to identify themseves. They do the same to humans.
Animal communication is any transfer of information on the part of one or more animals that has an effect on the current or future behaviour of another animal. The study of animal communication — sometimes called zoosemiotics (defined as the study of sign communication or semiosis in animals; distinguishable from anthroposemiotics, the study of human communication) — has played an important part in ethology, sociobiology, and the study of animal cognition.
Animal communication is a rapidly growing area of study. Even in the 21st century, many prior understandings related to diverse fields such as personal symbolic name use, animal emotions, animal culture, learning and even animal sexual behaviour, long thought to be well understood, have been revolutionized.
A working dog is a canine working animal, i.e., a type of dog that is not merely a pet but learns and performs tasks to assist and/or entertain its human companions, or a breed of such origin. In Australia and New Zealand, a working dog is one which has been trained to work livestock, irrespective of its breeding.
Within this general description, however, there are several ways in which the phrase is used.
Dog communication refers to movements and sounds dogs use to send signals to other dogs and other creatures (usually humans). Dog communication comes in a variety of forms and is part of the foundation of dog social behavior.
Dogs use certain movements of their bodies and body parts and different vocalizations to express their emotions: they move their ears, eyes, eyebrows, mouth, nose, head, tail and entire body, as well as barks, growls, whines and whimpers, and howls.
In journalism, a human interest story is a feature story that discusses a person or people in an emotional way. It presents people and their problems, concerns, or achievements in a way that brings about interest, sympathy or motivation in the reader or viewer.
Human interest stories may be "the story behind the story" about an event, organization, or otherwise faceless historical happening, such as about the life of an individual soldier during wartime, an interview with a survivor of a natural disaster, a random act of kindness or profile of someone known for a career achievement.