What happened to Spitz when he went after an exhausted Buck; after being chased by Dolly?

When Spitz attacked an exhausted Buck, Francois whipped him with the lash.

This was Spitz's opportunity. He sprang upon Buck, and twice his teeth sank into his unresisting foe and ripped and tore the flesh to the bone. Then Francois' lash descended, and Buck had the satisfaction of watching Spitz receive the worst whipping as yet administered to any of the team.