Dogs bark to communicate with other dogs and humans. They may bark to greet someone, to signal that they are in danger, or to ask for something.
Dogs bark to alert their owners of danger or something out of the ordinary. They may bark at strangers, loud noises, or unfamiliar objects.
Dogs bark to express emotions such as excitement, happiness, anger, or fear.
Dogs may bark out of boredom if they are not getting enough exercise or attention.
Dogs may bark if they are in pain. This is a way for them to communicate that something is wrong.
Dogs who suffer from separation anxiety may bark excessively when they are left alone. This is a way for them to express their anxiety and fear.
Some dogs bark to mark their territory. They may bark at other dogs, people, or animals who approach their home or yard.