By Jake Morrison | Published: February 14, 2026 | Updated: February 14, 2026
Most preventable equine diseases are not prevented because owners forget the schedule, not because the vaccines fail. I have managed barns where every horse was current, and barns where half the herd was six months behind. The difference is not money. It is a system: a calendar, a checklist, and someone responsible for making sure it happens.
This article provides a season-by-season preventative care framework that covers core vaccines, dental exams, parasite management, and the specific health checks that catch problems before they become emergencies. Use it as a template for your own barn calendar.
Core Vaccines: The Non-Negotiables
Core vaccines protect against diseases that are endemic, highly contagious, or pose serious public health risk. Every horse should receive these regardless of travel or competition schedule.
| Vaccine | Protects Against | Frequency |
|---|---|---|
| Tetanus | Clostridium tetani, enters through wounds | Annual booster; 2-week booster if wound occurs and status unknown |
| Eastern & Western Equine Encephalomyelitis | Mosquito-borne viral disease, fatal in 90% of cases | Annual, spring; 6-month in high-risk areas |
| West Nile Virus | Mosquito-borne neurological disease | Annual, spring |
| Rabies | Fatal neurological disease, zoonotic risk | Annual; required by law in many jurisdictions |
These four vaccines form the foundation. Without them, you are gambling with diseases that are either fatal or legally mandated. Do not skip them to save money.
Risk-Based Vaccines: Tailored to Lifestyle
Risk-based vaccines depend on your horse’s travel, competition, breeding, and exposure patterns. Consult your veterinarian to determine which are appropriate.
- Influenza: Essential for horses that travel, compete, or board where horses come and go frequently. Booster every 6–12 months.
- Herpesvirus (EHV-1, EHV-4): Recommended for competition horses, breeding stock, and horses on busy yards. EHV-1 is the abortion and neurological strain.
- Strangles: Consider for young horses, those in high-traffic barns, or during outbreaks. Intranasal or injectable options available.
- Botulism: Essential in regions where botulism is endemic, especially if horses eat haylage or silage.
- Rotavirus: For pregnant mares to protect foals through colostral antibodies.
- Leptospirosis: For horses in wet climates or those with access to standing water and wildlife.
Season-by-Season Care Calendar
Spring (March–May)
Spring is the reset point for the entire year. Everything starts here.
- Vaccines: Administer core vaccines (tetanus, EEE/WEE, West Nile, rabies) and risk-based vaccines as determined by your vet
- Dental exam: Annual float and oral examination. Spring is ideal because the horse has months of work ahead
- Fecal egg count: Baseline parasite load assessment before deworming program begins
- Coggins test: Required for interstate travel and most competitions; valid for 6–12 months depending on state
- Physical exam: Full veterinary check including heart, lungs, eyes, and body condition scoring
- Hoof assessment: Evaluate shoeing needs before competition season begins
Summer (June–August)
Summer is maintenance and monitoring season.
- Fly and insect control: Implement physical barriers, fly sheets, and pasture management
- Skin checks: Monitor for rain rot, scratches, sunburn, and allergic reactions
- Hydration monitoring: Ensure adequate water intake; add electrolytes for horses in heavy work
- Second fecal egg count: Mid-season parasite check, especially if spring count was elevated
- Hoof care: More frequent farrier visits if hooves grow faster in summer
- Heat stress awareness: Monitor for anhidrosis (inability to sweat) in hot, humid climates
Fall (September–November)
Fall is preparation for winter and transition time.
- Booster vaccines: Influenza and herpesvirus boosters for horses traveling to fall and winter shows
- Dental follow-up: Horses with significant dental issues may need a second float
- Body condition assessment: Ensure adequate weight going into winter; adjust feed before cold weather arrives
- Parasite management: Targeted deworming based on fall fecal egg count; bot removal after first frost
- Joint and mobility check: Arthritis and stiffness often worsen with cold; assess before winter
- Blanket and shelter prep: Clean, repair, and inventory winter blankets and stable sheets
Winter (December–February)
Winter is about maintenance, monitoring, and planning.
- Water source management: Prevent freezing; check bucket heaters and automatic waterers
- Respiratory health: Increase ventilation to reduce ammonia and dust; monitor for coughs and nasal discharge
- Hoof care: Snowball prevention, traction devices if needed, and thrush monitoring in wet stalls
- Weight monitoring: Horses burn more calories to stay warm; adjust hay and grain accordingly
- Year-end record review: Compile all vaccine dates, deworming records, and vet visits for the coming year
- Spring planning: Schedule spring vet appointments, Coggins tests, and farrier visits before the rush
Dental Care: More Than Just Floating
Annual dental exams are non-negotiable. Sharp enamel points, hooks, and ramps cause pain, reduce feed efficiency, and create behavioral issues that look like training problems.
A proper dental exam includes:
- Sedation for thorough oral examination
- Visual and manual inspection of all teeth
- Floating of sharp enamel points and hooks
- Assessment of bite alignment and jaw movement
- Evaluation for periodontal disease, loose teeth, or oral masses
Young horses (under 5) may need dental work every 6 months as deciduous teeth erupt and are shed. Senior horses (over 20) need careful monitoring for loose teeth, gum recession, and difficulty chewing long-stem forage.
Parasite Management: The Evidence-Based Approach
Rotational deworming every 6–8 weeks is outdated and contributes to anthelmintic resistance. Modern parasite management uses fecal egg counts to identify high, moderate, and low shedders, then targets treatment accordingly.
| Shedder Category | Egg Count (EPG) | Management |
|---|---|---|
| Low shedder | 0–200 | Deworm 1–2 times yearly; focus on spring and fall |
| Moderate shedder | 200–500 | Deworm 2–3 times yearly; rotate drug classes |
| High shedder | 500+ | Deworm 3–4 times yearly; consider daily pyrantel or targeted therapy |
Always perform a fecal egg count reduction test 10–14 days after deworming to confirm the product worked. If egg count reduction is less than 90%, you have resistance and need to change drug classes.
FAQ
Can I vaccinate my horse myself?
Technically yes, but I recommend veterinary administration for several reasons: proper vaccine handling and storage, correct injection technique, documentation for travel and competition, and professional judgment about which vaccines are appropriate. The cost difference is usually minimal.
What happens if I miss a vaccine booster?
Most vaccines require restarting the series if the booster is delayed beyond the manufacturer’s recommended window — typically 6 weeks to 6 months depending on the vaccine. This means more vet visits and higher cost. Keep a calendar.
How often does my horse really need dental work?
Annual exams for most adult horses. Every 6 months for horses under 5 or over 20, or horses with known dental issues. Horses with neglected mouths may need multiple visits to correct long-standing problems.
Is a Coggins test really necessary every year?
Yes, if you travel across state lines or compete. Many states require a current negative Coggins for entry, and most show venues demand it. The test detects equine infectious anemia, an incurable viral disease. It is not about your horse’s health — it is about protecting the equine population.
Final Thoughts
Preventative care is not glamorous. It does not show up in competition photos or social media posts. But it is the invisible infrastructure that keeps horses healthy, owners solvent, and barns running smoothly. The owners who spend the least on emergency vet bills are not the lucky ones. They are the ones who invested in prevention before the crisis.
Print this checklist. Put it on your barn wall. Assign someone to own it. And remember that nutrition is the foundation that makes all other preventative care more effective — a well-fed horse with a strong immune system responds better to vaccines, heals faster from dental work, and carries less parasite burden. If you are building your nutrition program, start with our guide to choosing the right high-protein feed for your horse’s workload.
Disclaimer: The content on this page is for informational purposes only and is not a substitute for professional veterinary advice. Vaccine protocols, parasite management, and dental schedules should be determined in consultation with a licensed equine veterinarian familiar with your region and your horse’s specific needs.
