Your veterinarian can assess the general health of the puppy and point out any problems. If you buy your puppy from a breeder, the breeder may have given the puppy his first vaccination.
All puppies should be vaccinated against canine diseases, checked periodically for worms and other parasites, and given an annual medical examination. Perhaps the most loving, responsible thing you can do for your pet is to see that he receives timely health care from a veterinarian. His life depends on it.