Equine health priorities change from birth to the senior years. Guides for foal care, young horses, breeding mares, stallions, and aging horses.
A foal needs colostrum early — antibody absorption is limited to roughly the first 18–24 hours — or risks life-threatening immune failure. A horse over 15 almost certainly benefits from annual ACTH testing to screen for Cushing's disease. A young horse's growth plates need protection from premature athletic loading. A pregnant mare needs EHV vaccination timed precisely to maximize colostrum antibody transfer.
These are not generic horse care recommendations — they are life-stage-specific priorities that change meaningfully as a horse ages. The guides below cover what matters most at each stage and what to discuss with your veterinarian.
| Topic | Key Point | Action |
|---|---|---|
| Neonatal foal (0–7 days) | IgG testing at 18–24 hrs; navel dipping; meconium passage monitoring | Schedule vet exam at 12–24 hours of age |
| Foal (1–6 months) | Primary vaccination series begins at 4–6 months; Parascaris deworming | Discuss with vet based on mare vaccination status |
| Weanling–2 years | OCD radiograph survey in high-risk breeds; dental exams as your vet recommends | Nutritional balance; avoid over-supplementation |
| 2–4 years | Growth plate closure timing; beginning training workload | Graduated conditioning; pre-training soundness eval |
| Adult horse (5–14) | Annual vaccinations, FEC-based deworming, dental exam, wellness visit | Coggins for travel; ACTH if any signs |
| 15+ years | Annual ACTH testing (PPID screen); biannual dental; biannual vet exam | Weight monitoring monthly; joint management discussion |
| Pregnant mare | EHV at 5/7/9 months; core vaccines 4–6 wks before foaling | Pre-breeding exam; colostrum quality test pre-foaling |
| Stallion | Annual pre-season BSE; current Coggins; penile hygiene | Illness 6–8 weeks before season = semen quality risk |
Different life stages create fundamentally different health priorities. A condition that's routine for a senior horse — PPID, dental wear, arthritis — is an emergency flag in a foal. Understanding what's appropriate for each stage makes you a more effective observer of your horse's health over a lifetime.
| Life Stage | Age Range | Primary Health Priorities | Most Impactful Annual Action |
|---|---|---|---|
| Newborn foal | Birth to 30 days | Colostrum/IgG adequacy; septicemia prevention; meconium passage; joint health | IgG test at 18–24 hours — everything else follows from this |
| Growing foal | 1 month to weaning (~6 months) | OCD risk from nutrition/growth rate; parasite exposure (Parascaris); passive immunity transition | Fecal check at 6–8 weeks; diet review to avoid rapid growth spurts |
| Weanling | 6–12 months | High parasite risk; dental eruption monitoring; OCD screening; stress from weaning | OCD radiographic survey if high-risk breed; vaccination primary series |
| Young horse | 1–4 years | Growth plate closure timing limits training intensity; dentition transition (baby → adult teeth); OCD management | Biannual dental exams; growth plate-appropriate training load |
| Mature performance horse | 4–15 years | Discipline-specific injury prevention; joint health management; gastric ulcers if high-performance | Annual pre-season soundness evaluation; discipline-specific joint program |
| Senior horse | 15+ years | PPID (Cushing's) — affects 20%+ over 15; dental wear reducing chewing efficiency; arthritis management; weight maintenance | Annual ACTH blood test — the single highest-impact action in a senior horse |
Vaccination timing is not one-size-fits-all — it depends on maternal antibody status, geographic risk, and the horse's intended use. The following provides general guidance; your veterinarian will customize timing based on your specific situation.
| Life Stage | Core Vaccines | Timing Notes | Risk-Based Additions |
|---|---|---|---|
| Foal from vaccinated dam | EEE/WEE, Tetanus, WNV, Rabies — primary series beginning at 4–6 months | Maternal antibodies interfere with earlier vaccination; wait for waning | Influenza, EHV starting at 6 months if exposure risk |
| Foal from unvaccinated dam | Same core vaccines beginning at 3–4 months | Start earlier due to lack of maternal protection | Discuss with vet based on facility exposure risk |
| Weanling–Yearling | Complete primary series; establish adult schedule by 18 months | Multiple boosters needed to complete primary series | Add risk-based based on show/event attendance |
| Adult horse (non-pregnant) | Annual core vaccines; risk-based as appropriate | Spring timing before mosquito season for WNV and EEE; Rabies annually | Influenza/EHV more often than annually for show horses; Strangles if high exposure |
| Pregnant mare | Core vaccines 4–6 weeks before foaling (maximizes colostrum antibodies); EHV at months 5, 7, 9 | Pre-foaling timing is critical for colostrum antibody transfer to foal | Botulism in endemic areas; discuss with reproductive vet |
| Senior horse (15+) | Same core protocol; may benefit from more frequent schedules due to immunosenescence | Discuss whether twice-yearly core vaccination is appropriate | Monitor response; senior horses may have reduced immune response to vaccines |
HorseVeterinarian.AI is a free educational resource from Bridle & Bit Magazine. Your horse's life-stage health plan is a conversation best had with a veterinarian who knows your horse.
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