How is this novel represents the Realism or Naturalism?

Jack London was all about the philosophy of "naturalism". This is mans' or dogs' inherent instinct . London's style is using a dog as our viewpoint without turning him into merely a caricature. So in light of that, here are three lessons in survival curtsy of Buck the dog.

1. Don't settle for the pampered life of civilization. Go and find your inner wolf.

2. Know when to fight and when not to fight. A wise dog lasts the longest.

3. Never give up. Through cold and pain, you can go the distance. You are part of nature and just as strong if you push yourself.

Jack London's themes are about naturalism. Some of his themes included nature vs nurture. He is a firm believer that your ancestral traits will show at some points and that everyone belongs in their natural environment.