Why do dogs bark?

[henrywilliam]

To express their needs, some dogs are bred to bark, they are staking out their territory, to alert the member of their pack of impending danger, when playing, just through sheer excitement, barking at other animals. Depending on where you are in the world, it could be squirrels of any other small animal.

[Ron]

dogs bark just because they can i think hahaha

[rosejack]

They bark because their owners have inadvertently rewarded excessive barking in the past. Through boredom or a lack of physical and mental stimulation.

[johnbravo]

My dog is little bit different from other dogs. It used bark when it any see any female dogs. It just expresses its love whenever it saw any pretty female dogs. I hope every one can understand about my dog. ha ha ha.....