Leptospirosis is prevented with vaccination; however, it is important to note that there are a number of strains of the disease. If you regularly work your pet (retrieving, flushing etc.), or you spend a large amount of time walking around lakes, rivers or canals, then please mention this to your vet and they will suggest a vaccination protocol that is best suited to your needs. The immunity that your pet receives from their vaccination, is only short lived so annual revaccination is needed to ensure your pet remains protected.
Hygiene is also important in stopping spread of disease. The bacteria are quickly destroyed by light and temperatures in excess of 20oC, therefore, it is recommended you keep your pet away from any water that appears stagnant or is in shaded areas.