After the puppy vaccine series, boosters are given every how many years or by a titer test?

• A. Every year
• B. Every 2 years
• C. Every 3 years or titer
• D. Every 5 years

Answer: (C)

After the puppy vaccine series, boosters are generally spaced about every three years for core vaccines. That long interval reflects the fact that these vaccines often produce lasting immunity, so yearly re-vaccination isn’t usually necessary. If a dog’s antibody levels are checked and shown to be protective, a booster can be postponed or avoided; this is done through titer testing, which measures antibody presence to determine whether immunity remains. Local laws and vaccine labels can influence exact timing, especially for rabies, but the standard concept you’re being tested on is three-year boosters or using a titer to guide the decision.