Emergency vets in Diamond Bar, CA
No clinic in our Diamond Bar data currently advertises dedicated emergency service — nearby emergency hospitals are listed below. Call first: ER availability and wait times change by the hour.
Red markers = emergency clinics. Click a marker for details.
Nearest emergency hospitals outside Diamond Bar
~9 miles away in Glendora
~18 miles away in Pasadena
Pasadena Veterinary Urgent Care
3415 East Colorado Boulevard, Pasadena, CA 91107
Hours: Mo-Tu,Fr 10:00-20:00; We-Th off; Sa-Su 08:00-18:00
Verified 2026-07-27
~20 miles away in Pasadena
Animal AM-Emergency Clinic of Pasadena
2121 East Foothill Boulevard, Pasadena, CA 91107
Verified 2026-07-27
~21 miles away in South Pasadena
~22 miles away in Fountain Valley
VCA Animal Hospital
18300 Euclid Street, Fountain Valley, CA 92708
Verified 2026-07-27
~23 miles away in Costa Mesa
Veterinary Emergency Group
2800 Harbor Boulevard, Costa Mesa, CA 92626
Verified 2026-07-27
Not an emergency? See all 2 vet clinics in Diamond Bar →
General-practice vets often take same-day urgent appointments during business hours, and most can refer you to an after-hours ER.
If your pet is in crisis right now
- Call the closest 24/7 hospital above and tell them you're coming — they'll prep for arrival.
- Suspected poisoning: ASPCA Animal Poison Control (888) 426-4435 (24/7, consultation fee applies).
- Keep your pet warm, contained, and moving as little as possible during transport.
- Ask for a written estimate and triage priority when you arrive — both are standard requests.