Which character is responsible for punishing Buck for being sour?

The character that punishes Buck for being sour is Dave. In the narrative, Dave takes on the role of a seasoned sled dog who exhibits a strong sense of duty and work ethic. When Buck shows signs of being discontented or rebellious, particularly in their demanding environment, it is Dave who enforces discipline among the team by punishing him.

Dave's actions reflect the survival instincts and harsh realities faced by the sled dogs; they must remain focused and cooperative to function effectively in their roles. This interaction showcases the dynamic between the dogs, highlighting the importance of maintaining order within the pack, especially when they are constantly challenged by the grueling conditions of their journey. This context emphasizes the loyalty and strict adherence to the pack's hierarchy, where failure to comply can lead to immediate consequences.