"Gulliver's Travels" by Jonathan Swift.

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…imals because that is how the Yahoos act like. Gulliver is very ashamed of being in the same form as these Yahoos and really wanted to stay with the Houyhnhnms but they reject him for being so much like a Yahoo. When reaches England, he is so disgusted by humans, that he would not stand the sight of them. Instead he buys two horses and loves and cares for them but not for his family.