In the world of dreams the rules of reality do not necessarily apply. Each dream is unique and it's a direct link to the soul and spirit. Psychology provides its own theories on what dreams mean, but so did tradition and the study of dreams for thousands of years before any relevant science had developed.
Dream Meanings - Horse
If you see yourself riding a horse, then you will experience happiness in your personal and professional life. If the horse is dirty then take care because your trust in others will be betrayed. If the horse is black then luck is on your side. Also, if you dream that you are riding across a river then you will have good luck while if you see yourself with many horses then great profits await you.