What change in environment significantly impacts Buck's development?

The transition from domestic life to the wilderness is a pivotal change in Buck's environment that plays a crucial role in his development throughout the story. Initially, Buck is a pampered pet, enjoying a comfortable life as a household dog in California. However, when he is stolen and sold into the harsh realities of the Yukon during the Gold Rush, he must adapt to a completely different set of challenges. This drastic shift forces him to rely on his instincts for survival, fostering a transformation from a domesticated pet to a wild creature equipped to thrive in nature.

This journey reflects the themes of survival and primal instincts, as Buck learns to navigate the brutal environment, forming new relationships and shedding the traits of his previous life. The wilderness not only tests his physical capabilities but also shapes his character, leading to profound growth and self-discovery that defines his evolution throughout the narrative. Thus, this transition marks a significant turning point in Buck's life, embodying the tension between civilization and the wild.