Backup 24/7 option
Inland Valley Veterinary Specialists & Emergency Center
If VCA California Veterinary Specialists - Ontario is too far or has a long wait, the next hospital open around the clock is 4.4 miles from Ontario and 4.8 miles from VCA California Veterinary Specialists - Ontario.
Emergency animal hospitals near Ontario
VCA California Veterinary Specialists - Ontario
Open now · 24/7VCA Animal Hospitals2409 S. Vineyard Avenue, Suite O, Ontario, CA 91761Emergency surgeryCT or MRIVerified November 4, 2026< 1 mile(909) 947-3600Inland Valley Veterinary Specialists & Emergency Center
Open now · 24/710 W 7th St, Upland, CA 91786Emergency surgeryBlood transfusionCareCreditScratchpayVerified November 4, 20264.4 miles(909) 931-7871VEG Rancho Cucamonga
Open now · 24/7Veterinary Emergency Group11425 Foothill Blvd, Rancho Cucamonga, CA 91730Exotic petsEmergency surgeryWalk-insVerified November 4, 20265.6 miles(909) 280-2496PETEMERG Emergency Animal Hospital
Open now · 24/712367 Foothill Blvd, Rancho Cucamonga, CA 91739Verified November 4, 20266.2 miles(949) 324-2444MarQueen Veterinary ER & Specialty Upland
Open now · 24/71582 N Benson Ave, Upland, CA 91786CT or MRICareCreditScratchpayVerified November 4, 20267.2 miles(909) 303-1700Corona Animal Emergency Center
Open now · 24/7541 N. Main Street, Suite 107, Corona, CA 92880Emergency surgeryBlood transfusionVerified November 4, 202611 miles(951) 482-5137Riverside Regional Veterinary Group
Open now · 24/74229 Van Buren Blvd, Riverside, CA 92503Verified November 6, 202612 miles(951) 689-0440VCA Yorba Regional Animal Hospital
Open now · 24/7VCA Animal Hospitals8290 E. Crystal Drive, Anaheim, CA 92807ICUCareCreditVerified November 4, 202614 miles(714) 921-8700VEG Anaheim Hills
Open now · 24/7Veterinary Emergency Group701 South Weir Canyon Road suite 101, Anaheim Hills, CA 92808Exotic petsEmergency surgeryWalk-insVerified November 4, 202614 miles(714) 616-5570Animal Emergency Clinic
Limited emergency hours22085 Commerce Way, Grand Terrace, CA 92313Emergency surgeryWalk-insCareCreditScratchpayVerified November 4, 202616 miles(909) 825-9350
Emergency coverage around Ontario
- Within 10 miles5hospitals5 open 24/7, 0 with limited hours
- Within 25 miles13hospitals10 open 24/7, 3 with limited hours
- Within 50 miles37hospitals32 open 24/7, 5 with limited hours
Open 24/7 or limited hours
Open 24 hours, 7 days (9)
- VCA California Veterinary Specialists - Ontario< 1 mile
- Inland Valley Veterinary Specialists & Emergency Center4.4 miles
- VEG Rancho Cucamonga5.6 miles
- PETEMERG Emergency Animal Hospital6.2 miles
- MarQueen Veterinary ER & Specialty Upland7.2 miles
- Corona Animal Emergency Center11 miles
- Riverside Regional Veterinary Group12 miles
- VCA Yorba Regional Animal Hospital14 miles
- VEG Anaheim Hills14 miles
Nights, weekends or limited hours (1)
- Animal Emergency Clinic16 milesLimited emergency hours Mon midnight to 8 am; Mon–Thu 6 pm to 8 am; Fri 6 pm to Sun midnight
ICU, exotic pets and payment plans
- ICU: 1 of 10 listedVCA Yorba Regional Animal Hospital (14 mi)
- Exotic pets: 2 of 10 listedVEG Rancho Cucamonga (5.6 mi), VEG Anaheim Hills (14 mi)
- CareCredit: 4 of 10 listedInland Valley Veterinary Specialists & Emergency Center (4.4 mi), MarQueen Veterinary ER & Specialty Upland (7.2 mi), VCA Yorba Regional Animal Hospital (14 mi), Animal Emergency Clinic (16 mi)
- Scratchpay: 3 of 10 listedInland Valley Veterinary Specialists & Emergency Center (4.4 mi), MarQueen Veterinary ER & Specialty Upland (7.2 mi), Animal Emergency Clinic (16 mi)
Counted from what each listed hospital states on its own website. A hospital not named may still offer it.
Distances are measured in a straight line from the center of Ontario. Hospital status and hours come from each hospital's own published information; see how we verify.
Regular daytime clinics in the area
These are not emergency hospitals. They are general practices from OpenStreetMap, listed for follow-up visits and non-urgent problems during their working hours. In an emergency, use the hospitals above.
- Ontario Veterinary Hospital, 121, (909) 984-2211 (3.3 miles)
- Banfield Pet Hospital, 10940 Foothill Boulevard, Rancho Cucamonga (5.4 miles)
- Banfield Pet Hospital, 823 Foothill Boulevard (5.9 miles)
- Terra Vista Animal Hospital, 7385 Milliken Avenue, Rancho Cucamonga, (909) 989-3999 (6.3 miles)
- Chino Hills Small Animal Hospital, 3415 Chino Avenue, Chino (7.3 miles)
Questions about emergency vets in Ontario
- Is there a 24-hour emergency vet in Ontario, CA?
- Yes. VCA California Veterinary Specialists - Ontario at 2409 S. Vineyard Avenue, Suite O is open 24 hours a day, 7 days a week. Phone (909) 947-3600. One of the listed hospitals has limited emergency hours only.
- How many emergency vets are near Ontario, CA?
- 5 within 10 miles, 13 within 25 miles and 37 within 50 miles of the center of Ontario; of those within 50 miles, 32 are open 24/7 and 5 have limited emergency hours.
- How much does an emergency vet visit cost near Ontario, CA?
- MarQueen Veterinary ER & Specialty Upland mentions a deposit on its website. None of the listed hospitals publishes an exam fee; ask for an estimate when you call.
- Is there an emergency vet for exotic pets near Ontario, CA?
- 2 listed hospitals state on their website that they treat exotic pets: VEG Rancho Cucamonga (5.6 miles) and VEG Anaheim Hills (14 miles). Call first and name the species: an exotic animal veterinarian is not on duty at every hour.
- Do emergency vets near Ontario, CA accept CareCredit or Scratchpay?
- CareCredit is mentioned by Inland Valley Veterinary Specialists & Emergency Center, MarQueen Veterinary ER & Specialty Upland, VCA Yorba Regional Animal Hospital and Animal Emergency Clinic. Scratchpay is mentioned by Inland Valley Veterinary Specialists & Emergency Center, MarQueen Veterinary ER & Specialty Upland and Animal Emergency Clinic. This is what each hospital states on its own website; confirm when you call.
- What should I do if my pet ate something toxic?
- Call ASPCA Animal Poison Control at (888) 426-4435 or Pet Poison Helpline at (855) 764-7661, both open 24/7 (a consultation fee may apply), and head toward the nearest emergency hospital while you talk to them.
Poison emergencies
If you think your pet swallowed something toxic
Call one of the two national animal poison lines while you get ready to leave. Both are staffed by veterinary toxicology specialists around the clock; expect a consultation fee per case.
ASPCA (888) 426-4435 Helpline (855) 764-7661
Numbers checked on the official ASPCA and Pet Poison Helpline sites, November 2026. What to do while you call. Dose calculators: chocolate, xylitol, grapes and raisins, ibuprofen.