A dog would not look back. It would keep running in panic. An intelligent being would stop, assess and devise a plan to stay alive.
It measures up the threat.
In that scene it becomes instantly clear that something is up. This is not a normal dog.
So for me, that scene just adds to the brilliance of that very good movie. For me its completely logical.
So many games are lost in time due to this.
My favourite game off all time, Homeworld, got remastered years ago. Its fantastic follow-up, cataclysm could not be included in the renaster. The reason? Lost source code. No backups, studio got bought, diveded, merged, shut down and nobody thoight it prudent to safeguard that what they bought; the code and ip.
It happens. Often.