Vaccines are one of the simplest ways to protect your horse from serious, sometimes fatal diseases. But not every horse needs every vaccine. The right horse vaccination schedule depends on where you live, how often your horse travels and its age. Here’s an overview of core and risk-based vaccines.
Quick Answer: The American Association of Equine Practitioners (AAEP) recommends core vaccines for all horses: tetanus, Eastern and Western equine encephalomyelitis, West Nile virus and rabies. Risk-based vaccines, such as influenza, equine herpesvirus (rhino), strangles and Potomac horse fever, depend on your horse’s lifestyle and location. Most adult horses get boosters once or twice a year.
Core Vaccines
The AAEP vaccination guidelines list these as core for all horses in North America:
| Vaccine | Disease | Why it matters |
|---|---|---|
| Tetanus | Clostridium tetani infection | Bacteria in soil enter wounds; often fatal |
| EEE/WEE | Eastern and Western equine encephalomyelitis | Mosquito-borne; severe brain disease |
| West Nile virus | West Nile neurologic disease | Mosquito-borne; can be fatal |
| Rabies | Rabies virus | Always fatal; can spread to people |
Risk-Based Vaccines
| Vaccine | Consider if your horse… |
|---|---|
| Equine influenza | Travels, shows or lives with horses that do |
| Equine herpesvirus (EHV-1/EHV-4, “rhino”) | Travels, is young, or is a pregnant mare |
| Strangles | Is in an area or barn with strangles risk |
| Potomac horse fever | Lives near rivers or streams where the disease occurs |
| Botulism | Eats round bales or lives in endemic areas; foals in some regions |
| Leptospirosis | Has exposure to wildlife or standing water |
| Rotavirus | Is a pregnant mare in an at-risk breeding farm |
Your vet will help you decide which are right for your horse.
Typical Schedule for Adult Horses
| Vaccine | Typical adult schedule |
|---|---|
| Tetanus | Yearly; booster at time of injury if more than 6 months since last dose |
| EEE/WEE | Yearly, in spring before mosquito season; twice yearly in some warm climates |
| West Nile virus | Yearly in spring; twice yearly in high-risk areas |
| Rabies | Yearly |
| Influenza | Every 6–12 months for horses at risk |
| EHV-1/EHV-4 | Every 6 months for horses at risk; specific schedule for pregnant mares |
| Strangles | Yearly for horses at risk |
Schedules vary by product and region. Always follow your vet’s plan.
Foals
Foals usually start their vaccine series at about 4 to 6 months of age, depending on the mare’s vaccination status. They need a series of doses spaced a few weeks apart to build immunity.
Pregnant Mares
Pregnant mares often receive EHV-1 vaccines at certain months of pregnancy to help prevent abortion, plus boosters for core vaccines 4 to 6 weeks before foaling to pass antibodies to the foal through colostrum.
Vaccine Reactions
Most horses have no problems. Mild reactions can include:
- Soreness or swelling at the injection site
- Mild fever
- Lethargy for a day or two
Rarely, horses have serious allergic reactions or abscesses at the injection site. Tell your vet about any past reactions.
Call your vet immediately if your horse has trouble breathing, hives, collapse or major swelling after a vaccine.
Why Your Vet Should Give Vaccines
- Proper handling and storage
- Correct timing for your horse’s needs
- A professional exam at the same time
- Records that may be required for travel and shows
- Help if a reaction occurs
Keep Good Records
Record dates, vaccine names and lot numbers. Many shows, boarding stables and states require proof of vaccination.
Part of a Complete Health Plan
Vaccines work best alongside:
- Parasite control. See deworming horses.
- Dental exams. See equine dental care.
- Hoof care. See hoof care basics.
Frequently Asked Questions
Does my horse need vaccines if it never leaves the farm?
Yes. Core diseases like tetanus, rabies and mosquito-borne viruses don’t need horse-to-horse contact.
Can I vaccinate my own horse?
In some places, owners can give certain vaccines, but rabies must usually be given by a vet. Many experts recommend having your vet give all vaccines.
When is the best time to vaccinate?
Spring is common for mosquito-borne diseases, before insect season. Your vet may recommend fall boosters in warm climates.
Can I ride after vaccinating?
Many vets recommend light work or rest for a day or two, especially if the horse seems sore.
Do older horses still need vaccines?
Yes. Senior horses may have weaker immune responses, so keeping them protected is important. Your vet may adjust the plan based on health.
What if my horse missed a booster?
Your vet may restart a series or give a single booster, depending on how long it’s been and the vaccine. Don’t skip core vaccines.
Are combination vaccines okay?
Yes. Many products combine core vaccines in one injection, which reduces the number of shots. Your vet will choose suitable products.
This article is for general information only and isn’t a substitute for professional veterinary advice. If you’re worried about your pet’s health, contact your veterinarian or an emergency animal hospital.
