The quotation “He did not steal for joy of it, but because of the clamor of his stomach” effectively illustrates how Buck is adapting to his new environment by highlighting his instinctual drive for survival. The essence of this adaptation is captured in the following response:
Buck is willing to do what is necessary to survive, including stealing from his peers.
This response emphasizes that Buck is no longer the domesticated pet he once was; he is learning to prioritize survival above all else. The mention of his "clamor of his stomach" indicates a primal urge that overtakes any moral considerations he might have had in his previous life. This moment signifies a critical turning point in his transformation, as he consciously makes the decision to engage in aggressive behavior in order to secure food for himself – a reflection of the harsh realities of the world he now inhabits.