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 - Hare
To chase a hare means that you are doing too many things that are not of benefit to you. If you simply see a hare running then you will enjoy sudden progress at work.