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Children born into slavery could be considered sheep only because they are not able to protect themselves. Although they do see the world as a bad place, children might have the outlook on life that there could still be hope.

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The slave owners would be considered the wolves as they preyed on the weak and took advantage of those that could not protect themselves.

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Those that helped free the enslaved like Harriet Tubman would be considered a sheepdog as there are few and far between.

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I would also consider Abraham Lincoln a sheepdog as he stood up for those that could not protect themselves and helped try to free the slaves.