When the boy tries to beat White Fang with a club, what does White Fang do?

White Fang bites him.... rips his arm open.

Holding his club prepared to strike, he drew in on his cornered quarry. White Fang was furious. He faced the boy, bristling and snarling, his sense of justice outraged. He knew the law of forage. All the wastage of meat, such as the frozen chips, belonged to the dog that found it. He had done no wrong, broken no law, yet here was this boy preparing to give him a beating. White Fang scarcely knew what happened. He did it in a surge of rage. And he did it so quickly that the boy did not know either. All the boy knew was that he had in some unaccountable way been overturned into the snow, and that his club-hand had been ripped wide open by White Fang’s teeth.