Final answer:
A scene in 'The Call of the Wild' showing another dog treating Buck with kindness by tending to his wounds captures the essence of mutual aid in the struggles for survival depicted by Jack London.
Step-by-step explanation:
The possible summary of a scene described in Jack London's 'The Call of the Wild' that most accurately reflects the relationship between Buck and another dog would be: "The other dog treats Buck kindly by licking Buck's sores as a doctor would clean a wound." This summary captures the essence of the interaction between the dogs in an environment where kindness is a form of survival and reciprocity, much like the theme throughout London's work, where the struggle for survival often brings out an innate sense of mutual aid amongst animals. In contrast to the notion that in the wild, all dogs only care about their own survival, London often portrays the cooperative aspect of animal relationships, even in harsh conditions.