Dog Investigates Ghost Haunting in Home

This clip is from Friday April 13, 2007. A man noticed that his dog seemed frightened at night, so he set up a hidden camera to find out what was the matter. The video captured the blinds moving on their own. The dog’s stare seems fixed on the blinds. Does his bewildered gaze indicate that there is no person manipulating the blinds? Could this be legitimate ghostly activity?