In the call of the wild, it was easy for Buck to save John Thorton from drowning, because of his valor and strength
In "The Call of the Wild," Buck's ability to save John Thornton from drowning was not solely due to his valor and strength, although those qualities did play a role. Buck's rescue of Thornton was mainly driven by his deep bond and loyalty towards his beloved master.
Throughout the story, Buck forms a strong attachment to Thornton, who treats him with kindness and respect. This bond sparks an intense desire within Buck to protect and serve Thornton at all costs. When Buck perceives Thornton's life is in danger as he falls into the rapids, he jumps into action without hesitation or consideration for his own safety.
While it is true that Buck's strength aids him in swimming against the powerful current and pulling Thornton to safety, it is his determination, intelligence, and the instinctual knowledge he has developed in the wild that truly enables him to rescue Thornton. Buck relies on his wilderness experience and survival skills, gained through challenging ordeals and interactions with other powerful and cunning dogs in the wild.
Furthermore, Buck's valor and strength alone would not have been enough to save Thornton if he did not possess the mental strength to overcome his fear and focus on the task at hand. Buck's devotion to Thornton and his understanding of the dire consequences if he fails to rescue his master fuel his bravery and push him to accomplish the seemingly impossible task.
Therefore, while Buck's valor and strength certainly contribute to his ability to save John Thornton from drowning, it is his deep bond, intelligence, determination, and reliance on his survival instincts that ultimately allow him to achieve this remarkable feat.