Both people and pets are helped tremendously by the medical procedure known as immunization. Immunizing a pet is both smart and very inexpensive protection against a variety of deadly diseases that are known to infect both dogs and cats. For many pet owners vaccinating their pets is a simple procedure. While the process is simple, deciding which vaccines to give and when has become more complicated. New vaccines for emerging diseases need to be given at different intervals and not all pets need every vaccination available to veterinarians.