Dog acts as if he sees a ghost in this 100 year old farm house

Arlo was fast asleep but suddenly he shoots up and did this! At the time this house was completely silent. It was not until later in the evening when this person watched the footage that they heard all of what is recorded. There was ZERO noise at the time they were filming! And no it’s not the first time something odd has occurred in thi > 100 year old farm house...