What are the primary challenges Buck faces in the wild?

Buck's primary challenges in the wild revolve around harsh environmental conditions, competition with other animals, and the essential need for survival. As Buck transitions from domesticated life to the harsh realities of nature, he must adapt to a world where the struggle for food and safety becomes paramount. The environment is often brutal, filled with extremes in weather and terrain that test his resilience. Additionally, Buck must learn to compete with not only the natural dangers posed by other wildlife but also with other dogs that may see him as a rival. These factors collectively create a strenuous backdrop for Buck's journey, emphasizing the theme of survival of the fittest in the wild and how he must evolve to thrive.