Because we consider ourselves to be better or higher life forms than animals(especially pigs) showing them to be the same as or better than us is a good satirical tool for exposing human folly or for showing human behavior to be animalistic. In animal farm George Orwell uses animals to represent specific people and also uses the tribulations of the animal society as a metaphor for the Russian revolution. Animals that are considered noble (
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in Gulliver's Travels. Horses are a good choice as a metaphor for model human behavior because they are considered to be a noble animal. I believe that both of the above uses of animals as metaphors in literature are effective because they successfully teach us lessons on how to live and how not to live.
Orwell, George. Animal Farm. Norwich: Fletcher and Son Ltd,
Swift, Jonathan. Gulliver's Travels. New York: Random House Inc.,