Call of the Wild
Why were the dogs unable to move the sled after Hal and Charles packed the sled?
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The dogs were unable to move the sled because the runners were frozen in the snow.
"It's not that I care a whoop what becomes of you, but for the dogs' sakes I just want to tell you, you can help them a mighty lot by
breaking out that sled. The runners are froze fast. Throw your weight against the gee-pole, right and left, and break it out."
Call of the Wild