Answer:
In "To Build a Fire" by Jack London, the man's dog behaves in a way that highlights its instinctual understanding of the harsh environment and the man's foolishness.
At the beginning of the story, the dog is described as being hesitant to leave the warmth of the campfire and follow the man on his journey through the cold wilderness. The dog instinctively knows the dangers of traveling in such cold conditions, and it is reluctant to leave the safety of the fire.
As the man and the dog continue their journey, the dog becomes increasingly wary of the environment. It often stops and sniffs the air, and it hesitates when crossing dangerous terrain. The man, on the other hand, is overconfident in his ability to navigate the wilderness and ignores the dog's warning signs.
As the story progresses and the man's situation becomes more dire, the dog becomes more and more distant from him. It refuses to go near him, and the man eventually realizes that the dog is only concerned with its own survival. In the end, the dog watches from a distance as the man succumbs to the cold and dies. The dog then turns and heads back towards civilization, where it knows it will be safe.