Final answer:
John Messner is characterized by his resilience and compassion as he battles against the harsh Yukon environment, particularly shown through his interactions with his dogs and his response to the surroundings.
Step-by-step explanation:
The character of John Messner is best developed through his interactions with the environment and his dogs, as presented in Jack London's adapted excerpt from A Day's Lodging. Messner is depicted as a man who, although initially succumbing to the brutal cold and apathy of the vast Yukon, shows signs of resilience and determination. This is evident when he takes active steps to address the needs of his dogs and himself, such as when he investigates a water-hole that the dogs have found, and when he assists the dogs in pulling the sled up the bank. Messner's awareness and response to the surroundings, as well as his interactions with the dogs, demonstrate his capability to adapt and persevere in a harsh environment. Furthermore, the portrayal of Messner standing up against the overwhelming cold and caring for the well-being of his dogs highlights his resilience against nature's challenges and his compassion.