Buck wanted to be the leader and didn't always do what Spitz wanted. What was the result of this?

The result of the competition between the two dogs is that Buck bides his time waiting to take over as leader. Buck is afforded this opportunity when the pack takes off after a rabbit, and Spitz gets to it first. Buck leaps on him, and the fight ensues. In the end, Buck is victorious, and Spitz is taken down by the pack.