Final answer:
In chapter 3 of The Call of the Wild, Buck is unlike any other dog Spitz has met before because he uses his intelligence and intuition when fighting.
Step-by-step explanation:
In chapter 3 of The Call of the Wild by Jack London, Buck is unlike any other dog Spitz has met before because Buck is the first dog who uses his intelligence and intuition when fighting. Unlike the other dogs who rely solely on brute strength, Buck is able to outsmart and outmaneuver his opponents by analyzing their moves and using his own skills strategically. This sets him apart from Spitz and the other dogs in the pack.