Black Beauty is one of those rare BOOKS that can preach without being preachy. Anna Sewell wrote this to illustrate the abuse of horses, in particulary the harsh use of the bearing rein. The bearing rein was used to get the horse's head arched, but made it difficult for the horse to breathe and near impossible for the horse to pull a carriage uphill. When Sewell died, the hearse to carry her body used horses with bearing reins. Her mother went out and made the driver get rid of them.