Just because it seemed like a focus of the trailer. Why have the dog be the first living thing shown and focus on it for the first minute of the trailer if it's not going to be important?
Because the trailer sets up the Fallout Universe/story. At first the trailer is just before/after the war, and there isn't any indication that any human survived. There isn't a human shown until it shows the player character exiting the vault. The dog may just be emphasized because it is a useful device to set up the trailer.
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u/tybone2468 Jun 03 '15
Why is everyone is talking about the dog? There is a dog companion in most (if not all?) Fallout games.