Here are the answers matched with the clues from "The Dominant Primordial Beast":
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François killed Dolly with an axe when she unexpectedly did this one morning as they were harnessing up. Went mad
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Buck fought with Spitz when the dog tried to take this away from him. His sleeping nest
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Buck caused this person to grin by lying on his back with his four feet in the air and refusing to budge without his moccasins. Perrault
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He predicated that one day Buck would get mad and kill Spitz. Francois
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The dogs in Dawson did this every night at twelve and again at three, and Buck was delighted to join in. Howled
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A band of them savagely attacked the camp Perrault and François had made on a frozen lake for the food they carried. Starving huskies
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After the attack on the camp left them with less food, damaged equipment, and injury, the sled-dogs and men still had to travel four hundred miles of trail to this place. Dawson
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Buck knew the time had come for this when Spitz ran in front of the pack and killed the rabbit they were chasing. A fight to the death
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After his fight to the death, this dog stood as the primordial beast who had made his kill and found it good. Buck
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It required six days of exhausting toil and risk of life to dog and man to cover its distance. The 30 Mile River
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