There are a few reasons why your dog may bark at nothing.
One reason may be that your dog is anxious or nervous, and is barking as a way to try and release that anxiety.
Another possibility is that your dog may be trying to alert you to something that he or she perceives as a threat, even if there is no danger present.
If your dog barks for no reason and it’s becoming a problem, you may want to consider consulting with a behaviorist or trainer to help determine the underlying cause and how to best address it.
In the meantime, try to provide your dog with plenty of opportunities for exercise and mental stimulation, as this can help reduce anxiety and help prevent boredom-related barking.
Additionally, make sure your dog is getting enough attention from you, as this can also help reduce barking. If you can determine the root cause of your dog’s barking and address it, your pup should eventually stop barking at nothing.