Dog communication is the transfer of information between dogs, and also the transfer of information between dogs and humans. Behaviors associated with dog communication include eye gaze, facial expression, vocalization, body posture (including movements of bodies and limbs) and gustatory communication (scents, pheromones and taste). Humans communicate with dogs by using vocalization, hand signals, body posture and touch.
Dog-human communication
Both
humans and dogs are characterized by complex social lives with rich
communication systems, but it is also possible that dogs, perhaps because of
their reliance on humans for food, have evolved specialized skills for
recognizing and interpreting human social-communicative signals. Four basic
hypotheses have been put forward to account for the findings.
Dogs,
by way of their interactions with humans, learn to be responsive to human
social cues through basic conditioning processes.
By
undergoing domestication, dogs not only reduced their fear of humans but also
applied all-purpose problem-solving skills to their interactions with people.
This largely innate gift for reading human social gestures was inadvertently
selected for via domestication.
Dogs'
co-evolution with humans equipped them with the cognitive machinery to not only
respond to human social cues but to understand human mental states; a so-called
theory of mind.
Dogs
are adaptively predisposed to learn about human communicative gestures. In
essence they come with a built-in "head start" to learn the
significance of people's gestures, in much the same way that white-crowned
sparrows acquire their species-typical song and ducklings imprint on their own
kind.
The
pointing gesture is a human-specific signal, is referential in its nature, and
is a foundational building block of human communication. Human infants acquire
it weeks before the first spoken word. In 2009, a study compared the responses
to a range of pointing gestures by dogs and human infants. The study showed
little difference in the performance of 2-year-old children and dogs, while
3-year-old children's performance was higher. The results also showed that all
subjects were able to generalize from their previous experience to respond to
relatively novel pointing gestures. These findings suggest that dogs demonstrate
a similar level of performance as 2-year-old children that can be explained as
a joint outcome of their evolutionary history as well as their socialization in
a human environment.
One
study has indicated that dogs are able to tell how big another dog is just by
listening to its growl. A specific growl is used by dogs to protect their food.
The research also shows that dogs do not, or can not, misrepresent their size,
and this is the first time research has shown animals can determine another's
size by the sound it makes. The test, using images of many kinds of dogs,
showed a small and big dog and played a growl. The result showed that 20 of the
24 test dogs looked at the image of the appropriately sized dog first and
looked at it longest.
Depending
on the context, a dog's barks can vary in timing, pitch, and amplitude. It is
possible that these have different meanings.
Additionally,
most people can tell from a bark whether a dog was alone or being approached by
a stranger, playing or being aggressive, and able tell from a growl how big the
dog is. This is thought to be evidence of human-dog coevolution.
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