There has been a lot of discussion over why dogs bark and what different sounds of barking mean.Just  as humans, dogs communicate too. Whereas humans communicate through speech and body language, dogs also use both sound and body language to communicate.

Humans have language that is explicable, but the  question that most dog lovers often ponder on is  whether dogs have a language that humans do  not  understand. A dog may move his ears,  head, tail, eyes  and eyebrows in a typical  manner to communicate. For  example, a tail  carried high is understood as a sign of    dominance or dog aggression, and if carried  low, it  signifies submission or insecurity.  However,  the communication skills of a dog are not limited to their  body language.

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Dogs evolved from wolves, but their barking has become significantly different from the parent species. Wolves howl or bay only in specific situations. The howling or baying is characterized by brevity  and isolation. On the contrary, a dog barks in long, rhythmic stanzas. Dogs bark more frequently and in numerous situations. The reason behind this is ascribed to the domestication of dogs.

Research on dog barking has shown that there are different types of dog barking. These can be classified as under:
A warning bark