The dog is feard while his owner lefted him.

A dog that is afraid while its owner is gone may be suffering from separation anxiety. Separation anxiety is a common behavioral disorder in dogs that can cause a variety of symptoms, including fear, anxiety, and destructive behavior. Dogs with separation anxiety may become anxious and upset when they are separated from their owners, even for short periods of time. They may also display destructive behaviors, such as barking, whining, chewing, or urinating in the house.