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SESK: Stuff Everyone Should Know · sesk.info/horse-tetanus-booster-injury

A vaccinated horse gets a wound 6 or more months after its last tetanus booster. What does the AAEP advise?

Booster at the time of injury, not at the next yearly visit.

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  1. Revaccinate right away with tetanus toxoid ✔
  2. Wait until the annual shot
  3. Skip it if the wound is small

Why: If a vaccinated horse's last tetanus shot was 6 or more months earlier, the AAEP says it should be revaccinated immediately at the time of injury or surgery. Call your vet to arrange it.

Huh, didn't know that: All horses are at risk of developing tetanus, says the AAEP.

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References

Answer: Revaccinate right away with tetanus toxoid. If a vaccinated horse's last tetanus shot was 6 or more months earlier, the AAEP says it should be revaccinated immediately at the time of injury or surgery. Call your vet to arrange it.

  1. Tetanus Vaccination Guidelines (AAEP) aaep.org/resource/tetanus-vaccination-guidelines
    sustain a wound or undergo surgery ≥ 6 months after their previous tetanus booster should be revaccinated
    Checked 2026-10-10.

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