What is the recommended schedule for distemper, hepatitis, and parvovirus vaccines (DHP) in puppies?

What is the recommended schedule for distemper, hepatitis, and parvovirus vaccines (DHP) in puppies?

• A. Start at 12 weeks, repeat every 6 weeks until 18 weeks, booster at 2 years.
• B. Start at 4 weeks and give monthly until 16 weeks.
• C. Start at 6-8 weeks, repeat every 3-4 weeks until 12-14 weeks old; booster at 1 year and repeated every 3 years.
• D. Start at 8 weeks; give only one dose.

Answer: (C)

The schedule tests the concept that puppies need a staged series of vaccines to build lasting protection as maternal antibodies wane. Beginning at 6–8 weeks and giving doses every 3–4 weeks until about 12–14 weeks ensures the puppy develops active immunity by the time maternal antibodies drop to non-protective levels. The booster at 1 year then re-stimulates the immune system, and subsequent boosters every 3 years align with how long the vaccine’s protection lasts. This approach balances initial priming with timely boosting, providing protection through the period of highest risk. Other options either start too early or too late, or fail to complete the necessary series and booster, leaving gaps in immunity.

The schedule tests the concept that puppies need a staged series of vaccines to build lasting protection as maternal antibodies wane. Beginning at 6–8 weeks and giving doses every 3–4 weeks until about 12–14 weeks ensures the puppy develops active immunity by the time maternal antibodies drop to non-protective levels. The booster at 1 year then re-stimulates the immune system, and subsequent boosters every 3 years align with how long the vaccine’s protection lasts.

This approach balances initial priming with timely boosting, providing protection through the period of highest risk. Other options either start too early or too late, or fail to complete the necessary series and booster, leaving gaps in immunity.