Vets in Ontario, CA
🚨 Emergency care14 vet clinics in Ontario. Call ahead for same-day availability; for after-hours crises, hit the red button.
Red markers = emergency clinics. Click a marker for details.
3085 S Archibald Ave # D, Ontario, CA 91761
Unverified listing — call ahead to confirm hours and availability.
2409 S Vineyard Ave, Ontario, CA 91761-6401
Unverified listing — call ahead to confirm hours and availability.
2131 S Grove Ave #F, Ontario, CA 91761
Unverified listing — call ahead to confirm hours and availability.
4120 E 4th St, Ontario, CA 91764
Unverified listing — call ahead to confirm hours and availability.
1511 W Holt Blvd Ste H, Ontario, CA 91762
Unverified listing — call ahead to confirm hours and availability.
13525 Euclid Ave, Ontario, CA 91762
Unverified listing — call ahead to confirm hours and availability.
2521 S Euclid Ave, Ontario, CA 91761
Unverified listing — call ahead to confirm hours and availability.
2417 S Grove Ave, Ontario, CA 91761
Unverified listing — call ahead to confirm hours and availability.
1155 N Mountain Ave, Ontario, CA 91762
Unverified listing — call ahead to confirm hours and availability.
3450 Ontario Ranch Rd Ste 6, Ontario, CA 91761
Unverified listing — call ahead to confirm hours and availability.
750 N Archibald Ave, Ontario, CA 91764
Unverified listing — call ahead to confirm hours and availability.
1620 Fremont Ct, Ontario, CA 91761-8319
Unverified listing — call ahead to confirm hours and availability.
2409 S. Vineyard Avenue, Suite O, Ontario, CA 91761
Hours: Mo-Su 00:00-23:59
Verified 2026-09-26
2409 S Vineyard Ave Ste M, Ontario, CA 91761
Unverified listing — call ahead to confirm hours and availability.
Emergency and after-hours cover in Ontario
None of the 14 practices we list in Ontario advertise emergency services — at 2am you are driving, so know where before you need to. Why most towns have no emergency hospital.
Nearest emergency hospitals outside Ontario
- VEG ER for Pets - Rancho Cucamonga — Rancho Cucamonga, ~7 miles away, roughly a 12 min drive, open 24h
- PetEmerg Emegency Animal Hospital — Rancho Cucamonga, ~7 miles away, roughly a 13 min drive, open 24h
- Arlington Animal Hospital — Riverside, ~10 miles away, roughly a 18 min drive, open 24h
- Veterinary Emergency Group - Anaheim — Anaheim, ~14 miles away, roughly a 25 min drive, open 24h
Distances are straight-line from Ontario; 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 Ontario say they offer
Grouped from what each practice states on its own website — we read 10 of the 14 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.
- Same-day appointments (1)
- Ontario Veterinarian
- House calls (1)
- A R Animal Hospital
- Telemedicine (1)
- Veterinary Dental Specialties and Oral Surgery
- Boarding (2)
- Mountain Avenue Animal Hospital, Ontario Veterinarian
- Grooming (1)
- Mountain Avenue Animal Hospital
- Ultrasound (2)
- Ontario Veterinarian, VCA California Veterinary Specialists
- Orthopedic surgery (4)
- A R Animal Hospital, Banfield Pet Hospital, Mountain Avenue Animal Hospital, Ontario Veterinarian
- Acupuncture (1)
- New Haven Animal Hospital
- Rehabilitation & physiotherapy (1)
- New Haven Animal Hospital
- Dermatology (1)
- Mountain Avenue Animal Hospital
- End-of-life care & euthanasia (1)
- Banfield Pet Hospital
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.