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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.
You puppy will need additional vaccinations after his first shots. Your vet will determine the exact schedule, but typically these booster shots are given every two to four weeks until the pup is about 16 weeks old.