It is highly advised to vaccinate your puppy against four potentially fatal diseases; Distemper, Parvovirus, Infectious Canine Hepatitis and Leptospirosis. The first vaccination should usually be given at eight weeks old. The second vaccination is due 2-4 weeks later. Vets will often worm your puppy at the same time and answer any questions you have relating to diet, exercise and everyday health issues. It is recommended to have a booster injection each year after this initial course.