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If my horse has a minor scrape or small cut, do I need to call the vet for a tetanus booster?

If your horse is current on their annual tetanus vaccination, they are likely well-protected. However, if the wound is deep, puncture-like, or contaminated, you should contact your vet to determine if an additional booster is necessary.

How soon after vaccination will my horse be protected against tetanus?

It typically takes about two weeks for a horse to develop a protective immune response following a vaccination. If your horse has never been vaccinated before, a two-dose primary series is required to establish immunity.

Can I vaccinate my horse myself, or does it have to be administered by a veterinarian?

While owners can purchase vaccines, it is highly recommended to have a veterinarian administer them. This ensures proper storage, handling, and documentation, and allows for a professional physical exam to confirm the horse is healthy enough to receive the vaccine.

What are the common side effects a horse might experience after receiving the tetanus vaccine?

Most horses handle the vaccine well, but some may experience mild localized swelling at the injection site, slight stiffness, or a temporary decrease in appetite. These symptoms usually resolve on their own within 24 to 48 hours.

Is tetanus still a risk for horses that spend most of their time in a clean, indoor stall?

Yes, the bacteria that cause tetanus are commonly found in soil and the digestive tracts of many animals, making them ubiquitous in the environment. Even indoor horses are at risk through exposure to stable equipment or minor injuries, so annual vaccination remains essential for all horses.

Is the tetanus vaccine expensive compared to other routine care?

The tetanus vaccine is widely considered one of the most affordable and cost-effective preventative measures in equine medicine. The cost is negligible compared to the extreme expense and low survival rate associated with treating a horse that has developed tetanus.

Overview

Tetanus, commonly known as "lockjaw," is a devastating neurological disease caused by a toxin-producing bacterium found in soil and manure. According to the American Association of Equine Practitioners (AAEP), tetanus is considered a "core" vaccine, meaning every horse, regardless of location or lifestyle, must be vaccinated against it due to the ever-present risk of exposure and the severity of the disease [Tetanus

AAEP](https://aaep.org/horsehealth/tetanus). Horses are the most susceptible of all domestic animals to this condition. The mortality rate for infected horses is alarmingly high, with clinical data suggesting that up to 80% of affected animals do not survive, even with intensive veterinary intervention [Tetanus in Horses
UC Davis School of Veterinary Medicine](https://ceh.vetmed.ucdavis.edu/health-topics/tetanus).

Causes & Risk Factors

The disease is caused by the bacterium Clostridium tetani. These bacteria are anaerobic, meaning they thrive in environments without oxygen, and they produce hardy spores that can survive in the soil for years [Tetanus in Animals

Merck Veterinary Manual](https://www.merckvetmanual.com/generalized-conditions/tetanus/tetanus-in-animals).

Primary Risk Factors include:

Puncture Wounds: The most common route of infection, as deep wounds create the oxygen-free environment these bacteria prefer [Tetanus in Horses
UC Davis School of Veterinary Medicine](https://ceh.vetmed.ucdavis.edu/health-topics/tetanus).
Surgical Procedures: Castrations or other field surgeries performed without proper sterile technique or on unvaccinated horses are high-risk events [Tetanus
AAEP](https://aaep.org/horsehealth/tetanus).
Foaling: Umbilical cord infections in newborn foals (umbilical tetanus) or reproductive tract injuries in postpartum mares can lead to infection [Tetanus
AAEP](https://aaep.org/horsehealth/tetanus).
Foot Injuries: Hoof punctures or deep cracks contaminated with soil are frequent entry points.

Signs & Symptoms

Symptoms usually appear within 10 to 14 days of infection, though the incubation period can range from a few days to several weeks [Tetanus in Animals

Merck Veterinary Manual](https://www.merckvetmanual.com/generalized-conditions/tetanus/tetanus-in-animals). The hallmark of the disease is extreme muscle rigidity caused by the neurotoxin tetanospasmin.

Watch for these clinical signs:

Sawhorse Stance: The horse stands with legs stiffly extended outward [Tetanus in Animals
Merck Veterinary Manual](https://www.merckvetmanual.com/generalized-conditions/tetanus/tetanus-in-animals).
Third Eyelid Prolapse: The third eyelid (nictitating membrane) flickers or remains visible, especially when the horse is startled [Clinical findings and therapeutic protocols of 17 horses with tetanus
NIH](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8914616/).
Lockjaw (Trismus): Severe spasms of the jaw muscles make it impossible for the horse to open its mouth to eat or drink [Tetanus in Animals
Merck Veterinary Manual](https://www.merckvetmanual.com/generalized-conditions/tetanus/tetanus-in-animals).
Hyperesthesia: Extreme sensitivity to light, sound, or touch, which can trigger violent muscle spasms [Clinical findings and therapeutic protocols of 17 horses with tetanus
NIH](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8914616/).
Stiff Gait: Difficulty walking, turning, or backing up.

Diagnosis

Veterinarians typically diagnose tetanus based on the horse’s history (such as a recent wound or unknown vaccination status) and the presence of classic clinical signs like the sawhorse stance and third eyelid prolapse [Tetanus in Horses

UC Davis School of Veterinary Medicine](https://ceh.vetmed.ucdavis.edu/health-topics/tetanus). While blood tests can sometimes identify the toxin, the diagnosis is primarily clinical because the toxin is often already bound to nerve cells by the time symptoms appear, making it difficult to detect in the bloodstream [Tetanus in Animals
Merck Veterinary Manual](https://www.merckvetmanual.com/generalized-conditions/tetanus/tetanus-in-animals).

Treatment & Management

Treatment is intensive, expensive, and often unsuccessful if the disease has progressed. It focuses on three goals: neutralizing remaining toxin, killing the bacteria, and providing supportive care.

Antitoxin: Tetanus antitoxin is administered to neutralize any toxin that has not yet bound to the nervous system [Tetanus
AAEP](https://aaep.org/horsehealth/tetanus).
Antibiotics: High-dose penicillin or metronidazole is used to kill the C. tetani bacteria at the site of infection [Clinical findings and therapeutic protocols of 17 horses with tetanus
NIH](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8914616/).
Environment: Horses must be kept in a dark, quiet, heavily padded stall to minimize triggers for spasms [Tetanus in Animals
Merck Veterinary Manual](https://www.merckvetmanual.com/generalized-conditions/tetanus/tetanus-in-animals).
Supportive Care: This may include IV fluids, feeding via a nasogastric tube if the horse cannot swallow, and sometimes using a sling to help the horse stay upright [Clinical findings and therapeutic protocols of 17 horses with tetanus
NIH](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8914616/).

Recovery & Aftercare

If a horse survives the initial acute phase, recovery is slow, typically taking 2 to 6 weeks [Tetanus in Animals

Merck Veterinary Manual](https://www.merckvetmanual.com/generalized-conditions/tetanus/tetanus-in-animals). During this time, the horse must remain in a low-stress environment. Muscle stiffness may persist for some time, and physical therapy or gradual return to exercise should only begin under strict veterinary supervision. It is important to note that surviving the disease does not provide future immunity; recovered horses must still be vaccinated [Tetanus
AAEP](https://aaep.org/horsehealth/tetanus).

Cost Considerations

Preventive vaccination is significantly more affordable than emergency treatment.

Vaccination Cost: A single tetanus toxoid vaccine typically costs between $20 and $40, though a farm call fee (ranging from $50 to $150) usually applies if the vet travels to your location [How Much Does an Equine Vet Visit Cost?
HorseCareFinder](https://horsecarefinder.com/equine-vet-visit-cost/).
Emergency Treatment Cost: Intensive care for a horse with tetanus can easily exceed $5,000 to $10,000 due to the need for 24-hour monitoring, expensive antitoxins, and prolonged hospitalization [How Much Does an Equine Vet Visit Cost?
HorseCareFinder](https://horsecarefinder.com/equine-vet-visit-cost/).

When to Contact a Vet

You should contact your veterinarian immediately if:

Your horse sustains a puncture wound or deep laceration.
It has been more than 6 months since your horse's last tetanus booster and they have sustained any injury [Tetanus
AAEP](https://aaep.org/horsehealth/tetanus).
You notice any stiffness, difficulty chewing, or the appearance of the third eyelid.
A newborn foal has a swollen or draining umbilicus.

Equine Tetanus Vaccination: Protecting Your Horse from Lockjaw