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Itâs not entirely clear why the length of acquired protection varies with different vaccines. A single dose of some vaccines provides lifelong immunity, while others require an additional dose (boosters) in order to maintain immunity.tâs not entirely clear why the length of acquired protection varies with different vaccines. A single dose of some vaccines provides lifelong immunity, while others require an additional dose (boosters) in order to maintain immunity.
Vaccination - Are Booster Vaccines Necessary for Dogs. Primary vaccination is essential in order to prevent the once common puppy diseases that caused high levels of fatality from returning. However, recent research indicates that not all vaccines require yearly boosters. There is no evidence that annual booster vaccination is anything but beneficial to the majority of pets.