Although Black Beauty is looked at as a children's novel, Sewell did not write the novel for children. She said that her purpose in writing the novel was "to induce kindness, sympathy, and an understanding treatment of horses"—an influence she attributed to an essay on animals she read earlier by Horace Bushnell (1802–1876) entitled "Essay on Animals".Gentle Heart: The Story of Anna Sewell , by Jen Longshaw. Her sympathetic portrayal of the plight of working animals led to a vast outpouring of concern for animal welfare and is said to have been instrumental in the abolition of the cruel practice of using the checkrein (or "bearing rein", a strap used to keep horses' heads high, fashionable in Victorian England but painful and damaging to a horse's neck). Black Beauty also mentions the use of blinkers on horses, concluding that this use is likely to cause accidents at night due to interference with "the full use of" a horse's ability to "see much better in the dark than men can."
