Top 10 vet clinics in Ontario
Ranked by how complete and owner-verified the listing info is — hours, phone, website, services. No pay-to-play.
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1VCA California Veterinary Specialists-Ontario
2409 S Vineyard Ave, Ontario, CA 91761
Mon-Sun Open 24 Hours
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2New Haven Animal Hospital
3450 E Ontario Ranch Rd Ste 6, Ontario, CA 91761
Monday–Friday: 9:00 AM – 6:00 PM, Saturday: 8:30 AM – 4:00 PM, Sunday: Closed
BEFORE YOU GO
Make your next vet visit easier
Prepare records, check services and plan the appointment.

Prepare for the first visit
Gather records, explain your questions and confirm the clinic’s arrival instructions.
Read the guide
Check the practice’s services
Confirm species, appointments and after-hours arrangements before choosing a location.
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Plan time for your appointment
Ask about check-in, the booked consultation and any additional waiting or collection time.
Read the guide-
5Euclid Veterinary Hospital
13525 Euclid Ave, Ontario, CA 91762
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6Mountain Avenue Animal Hospital
1155 N Mountain Ave, Ontario, CA 91762
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7Back To Health Veterinary Services
2131 S Grove Ave #F, Ontario, CA 91761
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8Inland Animal Hospital
2417 S Grove Ave, Ontario, CA 91761
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9Veterinary Dental Specialties and Oral Surgery
2409 S Vineyard Ave Ste M, Ontario, CA 91761
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10Ontario Veterinarian
1620 Fremont Ct, Ontario, CA 91761-8319
Of the 14 vet clinics listed in Ontario, 14 give a phone number, 3 publish opening hours and 11 have a website. 1 is a branch of a national chain — Banfield Pet Hospital (1); the remaining 13 are independent. By what they offer: 5 offer dental care, 2 offer spay and neuter, 2 offer emergency care. The longest-running is Animal Dermatology Clinic, in business since 2005. The nearest bigger selection is Los Angeles with 146.
All 4 other vet clinics in Ontario
Same order: the most complete listings first.
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New Haven Animal Hospital
3450 Ontario Ranch Rd Ste 6, Ontario, CA 91761
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Euclid Walnut Pet Clinic
2521 S Euclid Ave, Ontario, CA 91761
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City Pet Hospital
1511 W Holt Blvd Ste H, Ontario, CA 91762
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Dairy Veterinary Services
7440 Schaefer Ave, Ontario, CA 91762-7972
Nearby in California
- Chino10
- Upland13
- Rancho Cucamonga13
- Chino Hills6
- Norco6
- Fontana11
- Los Angeles146
- San Diego140