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Pei-Yen Chao

22039 Valley Blvd, Walnut, CA, 91789

Animal Hospital of Walnut is a veterinarian-owned general practice at 22039 Valley Blvd, Suite G in Walnut, serving the Walnut and Diamond Bar area since 1981 and treating dogs and cats. It offers wellness exams, vaccinations, parasite prevention, dentistry with dental x-rays, spay and neuter and other soft-tissue surgery, in-house diagnostics, and same-day urgent care appointments during business hours.

Call (909) 594-1737

Open until 6:00 PM today · closed Sunday

11 servicesDogs, Cats

EmergenciesUrgent care is offered during regular business hours only, for non-emergent concerns. The urgent care page states: "Animal Hospital of Walnut is pleased to offer urgent care services for your pet during our regular business hours" and "In the event you have an urgent or emergent situation outside of business hours, we recommend going to the following after-hours emergency clinics" — MarQueen Pet Emergency & Specialty in Upland, Inland Valley Veterinary Specialist and Emergency in Upland, and VCA California Veterinary Specialists-Ontario.

HoursOpen until 6:00 PM

Monday8:00 AM – 6:00 PM

Tuesday8:00 AM – 6:00 PM

Wednesday8:00 AM – 6:00 PM

Thursday8:00 AM – 6:00 PM

Friday8:00 AM – 6:00 PM

Saturday8:00 AM – 6:00 PM

SundayClosed

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What they do

11 services, one practice.

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Wellness ExamsVaccinationsParasite PreventionDental Care, Including Oral Exams, Teeth Cleaning And Polishing, Dental X-Rays And Tooth ExtractionSpay And NeuterSurgery, Including Hernia Repair, Mass Removal And Tumor Biopsy, Cystotomy, Gastrointestinal Surgery And SplenectomyDiagnostics, Including Blood Testing, Urinalysis, Fecal Exams, X-Rays And Focal UltrasoundNutrition ConsultationsMicrochippingSame-Day And Next-Day Urgent Care AppointmentsOnline Pharmacy

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Who they treat

2 species under this roof

DogsCats

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Compiled from public records and animalhospitalofwalnut.com, August 30, 2026. Not affiliated with PawsRx unless claimed, and details change, so confirm anything that matters when you call. Request removal.