Black Beauty by Anna Sewell

As a young horse, Black Beauty is well-loved and happy. But when his owner is forced to sell him, his life changes drastically. He has many new owners--some of them cruel and some of them kind. All he needs is someone to love him again...
Whether pulling an elegant carriage or a ramshackle cab, Black Beauty tries to live as best he can. This is his amazing story, told as only he could tell it.