One of the most common questions horse owners ask is: how often does my horse actually need to be vaccinated? The answer depends on the horse’s age, how it’s used, and which competition rules you follow — but the fundamentals are the same for most horses. This guide walks through how a typical vaccination schedule is built, so you know what to ask your vet.
Important: This is a general overview, not veterinary advice. The exact vaccines, intervals and any requirements are always determined by your veterinarian and by the current rules of your equestrian or breeding federation.
The most common vaccinations
| Vaccine | What it protects against | Typical pattern |
|---|---|---|
| Influenza | Equine flu (contagious respiratory infection) | Primary course followed by regular boosters |
| Tetanus | Tetanus from wounds and injuries | Primary course, then boosters at longer intervals |
| Equine herpesvirus (EHV) | Viral abortion and respiratory signs | Mainly for pregnant mares, on the vet’s schedule |
The exact intervals are governed by the manufacturer’s recommendations and your vet. If you compete, federation rules apply on top of that — these often impose stricter requirements on how tightly the flu boosters must be spaced.
Primary course and boosters
Most vaccination programmes are built on two phases:
- Primary course — a series of several doses a few weeks apart that builds the baseline protection in a horse that has not been vaccinated before.
- Boosters — top-up doses at regular intervals that keep protection up. Flu boosters are usually given far more frequently than tetanus boosters.
The critical detail is that a missed or late booster can break protection — and for competition horses it can mean the horse cannot start until the course has been rebuilt. That’s why it’s worth putting a little extra care into keeping the schedule.
Competition requirements — read the rules every season
If you compete nationally or internationally under FEI, there are specific influenza requirements: how often boosters must be given, and how many days before a competition the most recent dose must have been administered. These rules are updated periodically, so always check the current version ahead of the season. Staying one step ahead matters here — a booster given too late can disqualify an entire competition weekend.
Common mistakes to avoid
- Relying on memory. “I think it was September…” doesn’t cut it when the vet or competition office asks. Record every dose with a date.
- Forgetting youngsters and retirees. Even horses that don’t compete need baseline protection, especially against tetanus.
- Not counting backwards before a competition. Plan the booster well ahead of the first start, not the week before.
- Mixing up horses. In a yard with many horses, it’s easy for a dose to end up logged against the wrong individual.
Keeping it organised digitally
This is exactly where a digital vaccination record makes life easy. In EquiDuty you log each vaccination with a date and type, and the system automatically works out when the next dose is due and reminds you in good time. Everything is searchable in your pocket when the vet — or the competition office — asks.
To read more about how the feature works in practice, see our post on vaccinations and the health diary. And if you want your horse’s full health history in one place, it’s part of our horse registry.
A good vaccination schedule isn’t about memorising dates — it’s about having a system that remembers for you, so you can focus on the horse. Talk to your vet about what suits your horses, and let the technology handle the reminders.