From the text:
In the meantime the astonished team-dogs had burst out of their nests only to be set upon by the fierce invaders. Never had Buck seen such dogs. It seemed as though their bones would burst through their skins. They were mere skeletons, draped loosely in draggled hides, with blazing eyes and slavered fangs. But the hunger-madness made them terrifying, irresistible. There was no opposing them. The team-dogs were swept back against the cliff at the first onset. Buck was beset by three huskies, and in a trice his head and shoulders were ripped and slashed. The din was frightful. Billee was crying as usual. Dave and Sol-leks, dripping blood from a score of wounds, were fighting bravely side by side. Joe was snapping like a demon. Once, his teeth closed on the fore leg of a husky, and he crunched down through the bone. Pike, the malingerer, leaped upon the crippled animal, breaking its neck with a quick flash of teeth and a jerk, Buck got a frothing adversary by the throat, and was sprayed with blood when his teeth sank through the jugular. The warm taste of it in his mouth goaded him to greater fierceness. He flung himself upon another, and at the same time felt teeth sink into his own throat. It was Spitz, treacherously attacking from the side.
Perrault and Francois, having cleaned out their part of the camp, hurried to save their sled-dogs. The wild wave of famished beasts rolled back before them, and Buck shook himself free. But it was only for a moment. The two men were compelled to run back to save the grub, upon which the huskies returned to the attack on the team. Billee, terrified into bravery, sprang through the savage circle and fled away over the ice. Pike and Dub followed on his heels, with the rest of the team behind. As Buck drew himself together to spring after them, out of the tail of his eye he saw Spitz rush upon him with the evident intention of overthrowing him. Once off his feet and under that mass of huskies, there was no hope for him. But he braced himself to the shock of Spitz’s charge, then joined the flight out on the lake. Ch 3