To be in the best condition for pulling heavy loads, the dogs needed a diet that was high in fat. They ate whale and seal blubber and fatty meats during their long journeys, which kept them strong and gave them energy to keep going. The dogs' paws also needed special care to make sure that they did not become injured by sharp ice or extreme cold. Treating the paws with fat or wax helped the dogs to run safely and comfortably. Which sentence best states the author's point in this excerpt?

Sled dogs have to train regularly and extensively to pull the sleds.
Sled dogs eat foods that are unappealing and difficult to digest.
Sled dogs have very sensitive paws that require special care.
Sled dogs require a special diet and care to perform their jobs.

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