After the lynx what is White Fang’s next fight?

White Fang's next fight is against the bull-dog.

But after the lynx, all fighting ceased for White Fang. There were no more animals with which to fight—at least, there was none considered worthy of fighting with him. So he remained on exhibition until spring, when one Tim Keenan, a faro-dealer, arrived in the land. With him came the first bull-dog that had ever entered the Klondike.