What is the main idea of the book black beauty?

"Black Beauty," written by Anna Sewell, is a novel narrated by a horse named Black Beauty, who recounts his life experiences and the mistreatment he faces at the hands of various owners. The main idea revolves around advocating for animal welfare and highlighting the need for compassion and kindness towards animals. Through Black Beauty's story, Sewell critiques the harsh practices of the Victorian era and promotes a message of empathy and humane treatment for all living beings.