🤣 the dog.
Pmsl
First of all we are assuming the story itself is not a pile of wank. There's no evidence. Occam's razor - people make shit up.
So let's pretend the story itself is true. The dog was observed at all times was it? Under 24/7 surveillance to be able to say with certainty that it never ever put a paw into a part of the property?
Let's pretend that is also true.
So we first have to believe the person telling the story is not lying. We then have to believe the dog was under constant supervision. We do know one truth though. Dogs have an amazing sense of smell.
A dog in a new environment learns about that environment a lot by smell.
New smells take time to get used to.
The people, assuming the story is true, noticed the dog's behaviour and thought oooh spooky. Dog in new house is jumpy. Must be ghosts.
Dogs are super sensitive to people. If you're scared, nervous, upset, agitated ... Dog's going to sense something's up.
So the people reinforced to the dog that there was something dangerous in that part of this unfamiliar environment
Owners call in Ghostbusters.
Owners feel like they've been helped. They relax.
Dog sees owners less tense. Dog is also more familiar with house. Smells are not new now. Dog relaxed. People see dog relaxed, they relax
Dog sees people more relaxed, relaxes more. Everyone now in happy puddles of relaxation. All is well. Mystic Meg The Miraculous saved the day.
Or, Option B - secret portal to hell in the corner of the room. Satan stops by on Sundays .🤷