Your right Des,the rabies vaccines protects the dog for 2,5-3 years,but not only the Nobivac vaccine.We use as the top vaccines the Eurican made by merial france.From the studies that i`ve read for 3 years is protecting the vaccines against parvo, caree disease,and adenoviroses.Against leptospirosis, bordetella, and coronavirosis the dog is protected for 3-6 monts.As far as i know you have to vaccinate against the rabies every year (each country has his own law). Before the vaccination you must deworm correctly the dog,if he has worms, the immunity may not be assured.