It’s completely natural for dogs to bark, and it’s one of their most essential forms of communication after energy and body language. Dogs will bark as a warning, to guard their pack and territory. They’ll also bark to express excitement.
Those forms of barking are hardly ever a nuisance and don’t last for very long. That’s the reason why nuisance barking generally has the same cause and the same solution. When a dog barks too much, it’s almost always telling you that he’s bored and is searching for stimulation or a challenge.