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Since Diamond Bar Veterinary Clinic was founded in 1975, we have taken great pride in our highly skilled veterinary teams. The Diamond Bar Veterinary Clinic is a full service companion animal hospital. Our veterinarians, Dr. Choi D.V.M and Dr. Ahn D.V.M, are committed to provide quality veterinary care throughout your pet's lifetime. Our services and facilities are designed to accommodate routine preventive care through early detection and treatment of various diseases as your pet ages, as well as provide complete medical and surgical care as necessary throughout your pet's lifetime.

We understand the special role your pet plays in your family and are dedicated to becoming your partner throughout maintaining the well-being of your pet's health. We treat your pets as our own companions, and our goal is to practice the highest quality medicine and surgery with compassion and professionalism, focusing on educating our clients as well during the entire process.

Our veterinary team welcomes patients from Diamond Bar, Walnut, Rowland Heights, Chino Hills, West Covina, Chino and Pomona area to our conveniently located practice. 

Thank you for taking the time to read about our veterinary practice. We welcome your comments and suggestions.  Please contact us at (909) 861-9561 for all your pet health care needs. 

OUR DOCTORS are all highly skilled through EXTENSIVE INTERNSHIP training to provide comfort and knowledge to treat your pet’s even complicated health issues.

 At Diamond Bar Veterinary Clinic, you will find internship-trained veterinarians who have experience in busy urban animal hospitals. Internship-trained veterinarians are a select group of doctors who have completed highly sought after postgraduate internships at major training hospitals and have demonstrated academic and clinical excellence.

Preston Choi, DVM

Dr. Choi received his Doctor of Veterinary Medicine (DVM) degree in South Korea in 2008. He transferred to Oklahoma State University, College of Veterinary Medicine, Stillwater, OK for advanced education and clinical training. After studying at OSU, he completed a year long Small Animal Medicine and Surgery rotating internship at one of the most prestigious specialty hospitals in New York City, NY.

Dr. Choi is currently continuing his practice in So Cal since 2012.

His medical interests include emergency and critical medicine, internal medicine, general surgery and preventive medicine.

In his free time, Dr. Choi enjoys spending time with his wife, Dr. Ahn who is also a veterinarian at this clinic, and his feline son, Shane. 

Sohyun Ahn, DVM

Dr. Ahn holding a cat
Dr. Choi holding a dog

Dr.Ahn attended GSNU veterinary school in South Korea, attaining her degree in veterinary medicine (DVM) in 2008. After graduating from a clinical year at Oklahoma State University, she practiced in Irving, Texas for two years. She moved to California in 2013 and completed a year long small animal rotating internship at Animal Emergency Medical Center in Torrance, CA.

Dr. Ahn's professional interests include internal medicine, emergency and trauma medicine, preventive medicine, and veterinary acupuncture.  

During her time off, Dr. Ahn loves reading novels or hanging out with her family members and friends. 



1131 Grand Ave. Diamond Bar, CA 91765


Tel:  909-861-9561


Monday       8:00 AM - 6:00 PM

Tuesday       8:00 AM - 6:00 PM

Wednesday 8:00 AM - 6:00 PM

Thursday     8:00 AM - 6:00 PM

Friday           8:00 AM - 6:00 PM

Saturday      8:00 AM - 1:00 PM

Sunday         Close




Thank you for your inquiry! We will get back to you within 24-48 hours.

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