Buck sees the wolf he but didn't attack. Instead, he wanted to befriend the wolf. So Buck made friendly advances to the wolf. The wolf was suspicious and scared. Buck was three times bigger than him.
The wolf ran away out fear and the chase continued. The wolf sees that Buck means no harm. So the wolf allowed Buck to play with him. Although, Buck had John Thorton on his mind.
John was eating dinner when Buck ran into the camp and jumped on him. Buck covered him when licks. For the next two days and nights Buck never let John out of his sight. It was his job to protect Buck.
Buck starts to stay away from the camp for days at a time. He wandered for a week. He came back to the campsite and found Jack Thornton dead.
Buck seeks revenge on the Indians for what they did to John Thornton.
Buck goes back to the forest in search of the call of the wild