Vaccination schedules, strategic deworming, dental care, annual wellness exams, and biosecurity protocols — the foundational health calendar every horse owner should know, built on AAEP guidelines and established equine veterinary science.
The diseases, dental problems, and parasite burdens that cost the most to treat are overwhelmingly the ones that appropriate preventive care prevents or catches early. A consistent annual wellness program — vaccinations on schedule, targeted deworming based on fecal egg counts, biannual dental exams, and an annual veterinary examination — is the foundation of a long, healthy, productive equine career.
The guides below follow AAEP (American Association of Equine Practitioners) guidelines and current evidence-based veterinary practice. Each covers what the protocol is, why it matters, how it works, and the specific questions worth asking your veterinarian.
| Topic | Key Point | Action |
|---|---|---|
| Core Vaccines | EEE/WEE, Tetanus, West Nile, Rabies — annually for all horses | Schedule with your vet in early spring before mosquito season |
| Risk-Based Vaccines | Influenza, EHV, Strangles — based on exposure and event schedule | Every 3–6 months for performance and show horses |
| Fecal Egg Count | Identifies which horses need deworming and what products are still effective | Spring and fall; more frequently for high shedders |
| Bot Fly Treatment | Ivermectin or moxidectin after first killing frost — targets full season's larvae | Late fall or early winter; all horses regardless of FEC status |
| Dental Exam | Adult horses annually; under 5 or over 20 every 6 months | Schedule with annual wellness exam or separately |
| Annual Wellness Exam | Full physical, BCS, bloodwork discussion, vaccination and deworming review | Schedule same time each year; spring is common |
| ACTH Testing | Screen for Cushing's (PPID) — recommended from age 10+ | Spring for clearest results; fall if symptoms present |
| Coggins (EIA Test) | Required for travel and most competitions; 6 or 12 month validity varies by state | Annual; time with spring vet visit |
HorseVeterinarian.AI is a free educational resource from Bridle & Bit Magazine — Arizona's premier equestrian publication since 1978. The best preventive care happens in partnership with a licensed equine veterinarian who knows your horse.
Find an Equine Vet Near You →The economic argument for preventive care is unambiguous: the annual cost of a complete preventive program — vaccinations, deworming, dental, wellness exam — is a fraction of a single emergency veterinary episode. A colic surgery costs 10–20× a year's worth of preventive care. A case of strangles can sideline a horse for months. Understanding this context makes preventive investment feel not like an expense but like insurance with direct health benefits.
| Preventive Investment | Approximate Annual Cost | Emergency It Helps Prevent | Approximate Emergency Cost |
|---|---|---|---|
| Core vaccinations | $80–150 (with vet visit) | EEE, Tetanus, West Nile Disease | $1,000–5,000+ for treatment |
| Fecal egg count + targeted deworming | $50–120 per horse | Colic from parasitic damage; cyathostomin larval disease | $500–10,000+ (medical or surgical) |
| Annual dental exam | $100–250 (with sedation) | Weight loss from impaired chewing; choke; colic from poor mastication | $500–5,000 dental pathology treatment |
| Annual wellness exam | $75–200 | Missed PPID (Cushing's), EMS, early systemic disease | $500–3,000+ for acute management of undiagnosed chronic disease |
| Biosecurity protocols | Time + basic supplies | Strangles outbreak; EHV spread; Pigeon Fever transmission | $300–1,500 per affected horse; income loss if facility quarantined |
Arizona's climate creates a distinct preventive calendar driven by the monsoon season (July–September), the heat that peaks before it, and mild winters that maintain year-round parasite risk. The following framework should be customized with your veterinarian to match your specific horses, facility, and competition schedule.
| Period | Priority Action | Arizona-Specific Notes |
|---|---|---|
| January–February | Schedule spring wellness visits; Coggins renewals for competition horses; review deworming resistance data from prior year | Mild temps — ideal for dental procedures and early spring prep before heat arrives |
| March–April | Core spring vaccinations (EEE/WEE, West Nile, Tetanus, Rabies); risk-based vaccines for show/event horses; fecal egg count | Mosquito pressure begins early; don't delay West Nile vaccination |
| May–June | Pre-summer wellness checks; evaluate body condition before extreme heat; adjust nutrition and water management | Begin twice-daily water checks; electrolyte access critical; inspect hooves before dry-season cracking begins |
| July–September | Monsoon = Pigeon Fever season; fly control intensification; watch for rain rot and skin conditions; check for bot fly eggs | Peak Pigeon Fever risk August–October; aggressive fly control now; inspect horses daily for chest/belly swelling |
| October–November | Fall fecal egg count; bot fly treatment (after first cool nights); biannual dental for seniors and young horses | Bot fly egg-laying peaks late summer/fall; treat all horses regardless of FEC after temperatures drop consistently |
| December | Year-end ACTH testing for horses over 10 (if not tested spring); heater checks for water; winter nutrition review | PPID horses may need pergolide dose adjustment; ensure heated water access; body condition scoring before winter nutrition changes |
The annual wellness visit is most productive when you arrive prepared. The following information helps your veterinarian make informed decisions rather than starting from scratch each year.