What is the effect of having the final paragraph in "To Build a Fire" narrated from the dog's viewpoint?

It is important to remember that one of the major themes
of this excellent short story is Naturalism, which was a group of writers that believed
that human behaviour is determined by heredity and environment. In their work, these
writers present human beings as subject to natural forces beyond their control.
Throughout this story, the anonymous protagonist is shown to be arrogant and to
completely underestimate the power and danger of nature. The dog, on the other hand, is
shown to act as a foil to the man, being sensitive to nature and following his
instincts. The dog does not believe foolishly that he can master the situation through
the force of his own will. By giving the dog the last word in the story, London seems to
be emphasising the fact that animal instincts are superior to human judgement in this
situation. Note how the story ends:

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A little longer it delayed, howling under the
stars that leaped and danced and shone brightly in the cold sky. Then it turned and
trotted up the trail in the direction of the camp it knew, where were the other food
providers and fire
providers.

Ironically, it is
the dog, and not the man, who trots safely off at the end of the tale to the camp, where
he knows there is food and warmth. With the contrast between the dog that is alive and
well and the frozen corpse of the man, nature is shown to be utterly indifferent to
human beings.