Although we can easily see that the dog was frustrated,
it was interesting to listen to his `doggie talk' as he/she
kept trying to pass through the gap.
What I'm trying to say here is,
that if we were actually there at the time, or later listening to this video,
if we had been blind folded or if we were truly blind,
most people upon hearing the dog would pick-up that
the dog was anxious about something that was happening,
which means the dog was consciously trying to communicate with us.