Vets in O'Fallon, MO
🚨 Emergency care3 vet clinics in O'Fallon — including 1 with emergency services (marked in red). Call ahead for same-day availability; for after-hours crises, hit the red button.
Red markers = emergency clinics. Click a marker for details.
Animal Emergency Clinic
334 Fort Zumwalt Square, O'Fallon, MO 63366
Verified 2026-07-27
3079 State Hwy K, O'Fallon, MO 63368
Hours: Mo-Fr 07:30-18:00; Sa 08:00-13:00
Unverified listing — call ahead to confirm hours and availability.
VCA All Creatures Animal Hospital
2205 Highway K, O'Fallon, MO 63368
Hours: Mo-Fr 07:30-20:00; Sa 08:00-15:00; Su off
Unverified listing — call ahead to confirm hours and availability.
Emergency and after-hours cover in O'Fallon
One practice in O'Fallon post 24-hour hours and one offers emergency services — call before setting off; overnight staffing changes and full ICUs divert cases.
Nearest emergency hospitals outside O'Fallon
- Animal Talk Medical Center — Wentzville, ~6 miles away, roughly a 10 min drive
- Veterinary Emergency Group — Brentwood, ~23 miles away, roughly a 31 min drive, open 24h
- Animal Emergency Center — Collinsville, ~38 miles away, roughly a 51 min drive
- Hawthorne Animal Hospital — Edwardsville, ~40 miles away, roughly a 54 min drive, open 24h
Distances are straight-line from O'Fallon; drive times are estimates, not live traffic.
For a suspected poisoning, ASPCA Animal Poison Control on (888) 426-4435 (24/7, consultation fee applies) can give you treatment advice immediately — often while you are still deciding whether to drive anywhere.
About this list
Ordering is objective — 24/7 first, then emergency services, then alphabetical — and no clinic can pay for placement. Across United States, an emergency exam typically runs $100–$250 and an overnight emergency $800–$3,000 — full cost breakdown · if you cannot pay.