Many pet owners express concerns about over-vaccinating their pets. Certain vaccines, like Bordetella and Leptospirosis, must be updated yearly in order to maintain immunity. However, research tells us that other vaccines are effective for much longer than that. Many animal hospitals follow a 3-year protocol for the DA2PP (canine distemper/parvovirus), FVRCP (feline distemper/panleukopenia), and canine Rabies vaccines. Alternatively, titer testing is another substitute for yearly vaccinations. A vaccine titer is a simple blood test that measures the antibody level, or amount of immunity, that a pet carries against a specific virus. Titer tests are available for feline panleukopenia, canine distemper, and canine parvovirus, which are some of the major diseases that cats and dogs need to be protected against.