For those interested for a more indepth discussion of the movie I would suggest "All About the Thing" by Robert Meakin, which you can read here...
https://www.yumpu.com/en/document/view/10016760/all-about-the-thing
Here's a brief part of the book:
"And then comes one of the great shots of the film. The dog slowly enters a
corridor, his head cocked, walks towards us, pauses at one doorway and glances inside,
seemingly to check if it is empty, walks towards us again, pauses to look inside another
room, and then enters. We pan around to follow him but then hold on the wall, which
shows a human shadow. The shadow turns to look at the noise. Fade out. In one sense
this is lightening caught in a bottle: It’s amazing just how well the dog acts.
We know something important has happened but not to whom. Important
information is being withheld. It is the first time such explicit control has been exercised
since we saw the flying saucer at the beginning. It creates terrific suspense but it also
reminds us of the guiding intelligence telling the story. The film is not discovering the
story as we do (a favourite approach for action films because it can create a sense of
urgency), instead it is being presented to us. It is unusual for this film to take over so
explicitly but that sense of control is always there."
