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States regulate the age at which it is first administered.

A second vaccination is recommended after 1 year, then boosters every 3 years.

Puppies need a booster 1 year after completing their initial series, then all dogs need a booster every 3 years or more often. Core dog vaccine.

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Annual booster vaccinations are needed throughout your dog's life to maintain their protection from harmful disease. Some boosters are required every year, while others are needed every three years; this is because the protection they offer becomes less effective over time.

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