Vets in O'Fallon, MO
🚨 Emergency care12 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
957 Waterbury Falls Dr, O'Fallon, MO 63368
Unverified listing — call ahead to confirm hours and availability.
1290 Bryan Rd, O'Fallon, MO 63366
Unverified listing — call ahead to confirm hours and availability.
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.
1632 N Main St, O'Fallon, MO 63366
Unverified listing — call ahead to confirm hours and availability.
4681 Highway K, O'Fallon, MO 63368-8690
Unverified listing — call ahead to confirm hours and availability.
975 Cool Springs Industrial Dr, O'Fallon, MO 63366
Unverified listing — call ahead to confirm hours and availability.
2301 Technology Dr, O'Fallon, MO 63368
Unverified listing — call ahead to confirm hours and availability.
2963 State Hwy K, O'Fallon, MO 63368
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
Verified 2026-09-26
1031 Meyer Road, O'Fallon, MO 63385
Unverified listing — call ahead to confirm hours and availability.
7770 Winghaven Blvd, O'Fallon, MO 63368
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
- VEG ER for Pets - St. Peters — St. Peters, ~5 miles away, roughly a 15 min drive, open 24h
- 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
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.
What vets in O'Fallon say they offer
Grouped from what each practice states on its own website — we read 11 of the 12 listed here. A practice missing from a row hasn't said so on its site; that is not the same as not offering it, so call to check.
- Walk-ins welcome (1)
- UrgentVet
- Same-day appointments (1)
- UrgentVet
- Accepting new patients (1)
- Gentle Doctor Animal Hospital
- Payment plans or financing (3)
- Animal Emergency Clinic, Back on Track Veterinary Hospital and Rehabilitation Center, Gentle Doctor Animal Hospital
- Grooming (1)
- VCA All Creatures Animal Hospital
- Orthopedic surgery (2)
- Animal Emergency Clinic, Veterinary Orthopedic Surgery Center
- Acupuncture (1)
- Back on Track Veterinary Hospital and Rehabilitation Center
- Rehabilitation & physiotherapy (3)
- Back on Track Veterinary Hospital and Rehabilitation Center, The Pet Doctor, Veterinary Specialty Services - West
- Cardiology (1)
- Veterinary Specialty Services - West
- Oncology (3)
- Animal Emergency Clinic, Gentle Doctor Animal Hospital, Veterinary Specialty Services - West
- End-of-life care & euthanasia (2)
- UrgentVet, VCA All Creatures Animal Hospital
- AAHA-accredited (1)
- The Pet Doctor
- Fear Free certified staff (1)
- UrgentVet
- Cat Friendly Practice (1)
- The Pet Doctor
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.