I recommend Black Beauty, even to non-horse lovers.
Black Beauty has such a deep and rich story behind it. the author Anna Sewell was in a bad accident when she was around 11. She grew up to love horse and appreciate them more. She grew up in the beginning and mid 1800's so horses weren't often seen as loving creatures but more like machines. When she was bed ridden and excepted to die within a few months she got right onto writing her tale which was a fictional story about a beautiful black horse who had around 7 owners, some good and some bad. Some abused him and others treasured him.
She wrote it to bring awareness to animal abuse. She took about 6 years to write it, despite that her doctor said she would only survive 6 more months. You see, her accident left her with a broken leg that the bone was set wrong in. It caused an infection which poisoned her. She died a few months after Black Beauty's release.
Her book broke records for sales of a fictional store. It turned into a classic children's book as well (Which wasn't' her original intentions). It was given out as a hand book to animal rights and children bought it. It was a great book, too bad she died before seeing it's success. She was so sick that near the end, she could only write a sentence or two.
There were many parts in the book where Faith is spoken about, i believe Anna was Christian and that God allowed her to live so long as to write it, and help stop animal abuse. Animals can't helpt that they are born as animals, God has a special purpose for all of his living creatures too!