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Which lines from the text most clearly describe the role of the dogs in the story?

But there was life, abroad in the land and defiant. Down the frozen waterway toiled a string of wolfish dogs.

Their breath froze in the air as it left their mouths, spouting forth in a vapor that settled upon the hair of their bodies and formed into crystals of frost.

In advance of the dogs, on wide snowshoes, toiled a man. At the rear of the sled toiled a second man.

Leather harness was on the dogs, and leather traces attached them to a sled which dragged along behind.