Kholstomer

"Kholstomer" is one of the most striking stories in Russian literature. It was started by Leo Tolstoy in 1863 and left unfinished until 1886, when it was reworked and published as "Kholstomer: The story prominently features the technique of defamiliarization by adopting the perspective of a horse to expose some of the irrationalities of human conventions.
(Excerpt from Wikipedia)