Animal Hospital of Walnut
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Diamond Bar Veterinarians
Our mission is to make a difference in the lives of pets and the people who love them. Our belief is that clients and their pets should always be treated with compassion, dignity, and respect. They are the core of our existence and will forever be our focus.

Helping Pets since 1981

Dr. Damon Goldstein, DVM, Diplomate ABVP
Dr Damon Goldstein, DVMDr Goldstein is the founder of the practice in 1981. With a life-long passion to help dogs and cats and a dedication to deliver superior, multi-disciplinary

veterinary care.

"My belief is that clients and their pets always be treated with compassion, dignity and respect. I am continually inspired by my clients and patients. The human-animal bond is amazing and truly unique.

An old familiar story of the boy who dreamed of being a Vet since three years old! In high school and College I worked for Vets and worked on farms with dairy cows. I was Pre-Vet in College at Cornell University.

I enjoy Internal Medicine, Dermatology and General Surgery and Dentistry. I am committed to life long learning and continuing education. I have become a specialist to be the best vet that I can be.

I grew up in Long Island, New York. My house was on a small lake and stream. I loved to fish and find turtles, frogs, snakes, etc. My parents encouraged my interest in animals and my house was filled with pets.

My family now consists of Ajax, my Aussie, who never leaves my side. Chloe is my senior girl, she needs a lot of care. Zeke and Stella are my cats who entertain me with their antics and playfulness. I have three kids and three grandchildren. My grandson is a Leukemia Survivor. My daughter is a Chef in L.A. My son is a Professor of Religion at USC. My other daughter is a freshman at NYU.

I love to camp and travel. Last year my wife and I toured Turkey which was great. My hobby is Yoga. Especially Iyengar yoga.
Damon Goldstein, DVM
My work is very satisfying and I am grateful to be a Veterinarian. A fun story was how I taught my Golden Retriever how to swim in the ocean. I took her in the water with a pod of dolphins and they showed her 'how to swim!' "

Damon Goldstein, DVM
Dr. Goldstein graduated from Cornell University Veterinary College in 1972. He is a Board Certified Specialist in Canine and Feline Practice. Becoming a Board Certified Specialist entails a very rigorous course of additional studies and examinations. In addition, Diplomates must prepare and re-certify in their specialty every ten years. He has the distinction and status of earning a Professional Certification from the American Board of Veterinary Practitioners. In fact, Dr. Goldstein is one of only 900 ABVP Diplomates in the United States and abroad. He is dedicated to deliver superior, comprehensive, multi-disciplinary veterinary service to cats and dogs.

Dr. Goldstein is a member of prestigious local and national veterinary organizations, including the American Veterinary Medical Association, the California Veterinary Medical Association, the Southern California Veterinary Medical Association, Accreditation for the USDA’s Animal and Plant Health Inspection Service and the American Animal Hospital Association. He is a founding director and current board member of the East Valley Emergency Pet Clinic in Diamond Bar and the Inland Valley Emergency Pet Clinic in Upland; as well as a member of the San Gabriel Valley Emergency Pet Clinic in El Monte. Dr. Goldstein mentors 4th year veterinary students from the Western University College of Veterinary Medicine and is also a committee member to interview students applying for admission to WesternU.

Dr. Preston Choi, DVM
Dr Choi, DVM Dr. Choi received his
DVM degree
from Gyeonsang National University, College of Veterinary Medicine, 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 has practiced in So Cal since 2008. His medical interests include emergency and critical medicine, internal medicine and general surgery.

"One of the most wonderful stories from my time as a vet is about Sheldon. Sheldon came in to me when he was three weeks old with his 5 other siblings. He was cute and adorable like other boxer puppies, but his belly was very distended. I found he was born with closed anus, which is called medically atresia ani. His bowel was full of stool and he appeared very uncomfortable. The owner could not afford to do surgery and did not know what to do. It was very kind of one of my technicians to adopt him and let me fix the problem. I made an opening of the anus, which allowed him to finally have bowel movements. Due to his distended colon, he struggled with issues associated with megacolon, but he got to enjoy life with the hospital staff and new owner. He was finally a happy, playful boxer puppy. Here are a few pictures of him as he grew up."
3 week Boxer puppyBoxer puppy recoveringBoxer fully recoveredDr Choi and Sheldon
In his free time, Dr. Choi enjoys spending time with his wife who is also a veterinarian, and his feline son, Shane. He likes outdoor activities that include mountain biking, horseback riding and golfing.

Dr. Charles Mintzer, DVM
Dr Charles Mintzer, DVM By the time Charles Mintzer was 10 years old, he was already known as the neighborhood

animal caretaker.

Growing up in a small Queens, New York apartment, Charles often walked neighbors’ pets and was always concerned about their health. In his own home, Charles kept non-traditional pets such as chameleons, garden snakes, a myna bird, and a baby chick that somehow grew into a raucous rooster. Following a family trip to Florida, Charles even found himself with a baby alligator. Young Charles’ affinity for animals continued throughout his life, providing him with a wonderful foundation for his veterinary career!

Growing up with his mother and older sister, Charles enjoyed playing roller hockey, football, and stick-ball. He competed in Little League baseball until age 10, when he realized that he didn’t have the talent to succeed as a professional baseball player. Once he abandoned that goal, Charles happily focused on becoming a veterinarian, and enjoyed his mother’s lifelong support for his career choice.

During Charles’ high school years, he participated in a program for students who planned to become veterinarians. For two summers, Charles worked on dairy farms in upstate New York. Next, he enrolled in Cornell University’s undergraduate program, and worked in animal hospitals during his summers. In 1978, Charles graduated from the Cornell University College of Veterinary medicine. By that time, Charles was ready for a change of climate, and happily moved to warm, sunny southern California.

After purchasing and growing his own veterinary practice, Dr. Mintzer combined his efforts with Dr. Beighlie in 2008. After both practices were merged, the new All Pets Medical and Surgical Center offered more sophisticated technology and expanded treatment options. In particular, Dr. Mintzer is intrigued by veterinary dermatology; and he has been fortunate to receive additional training from recognized dermatology specialists.
Charles Mintzer, DVM
Dr. Mintzer has also become knowledgeable about veterinary dentistry, and has concerns about the potentially severe impacts of poor dental care on an animal’s overall health. He very much wants to focus on dental disease prevention, as the problems are often far advanced by the time his clients notice any symptoms.
Santa Dr Mintzer with his mother
While Dr. Mintzer appreciates the technology and treatments at his command, he always focuses on the profound human-animal bond at the heart of his clients’ relationships with their pets. His first dog Angel, a beautiful golden retriever who enriched the entire family’s life, taught him the life-changing importance of that relationship.

When Dr. Mintzer’s away from the hospital, he enjoys life with his wife Leslie. He’s also an energetic ice hockey player, and his team has won the league championship several times in the past few years. The couple’s son is currently a junior in college; and he enjoys playing a few rounds of golf with his father during breaks from school. The couple’s fourth-grade daughter is an active young lady who enjoys sports, dancing, and singing in the choir.

Finally, the Mintzer home has a well-balanced complement of furry family members. Carson the Chihuahua loves to relax on the Lazy Boy recliner with Dr. Mintzer’s mother, who also lives with the family. Mowgli the French bulldog is a people magnet who loves everyone. In contrast, the family’s two cats, Crookshanks and Sauly, have adopted their own agenda. These two independent felines believe they belong at the top of the household pecking order.

Dr. Thomas Beighlie, DVM
Dr Thomas Beighlie, DVM Dr. Beighlie’s

veterinary medicine

career has proven immensely satisfying for him. Most importantly, he feels an inner warmth when he can use his skills to keep animals healthy. Healthy, well-cared-for pets can enjoy longer relationships with their pet parents. Dr. Beighlie also likes to use his scientific mindset to solve complex medical cases that resemble intricate puzzles. Finally, Dr. Beighlie satisfies his artisan nature by using his hands to perform healing surgeries. Each day, he feels fortunate that he’s found a gratifying career that allows him to serve his clients and their beloved pets!

Thomas Beighlie grew up with agriculture in his genes, as his ancestors had homesteaded the Midwestern United States. His parents pursued a different path, though, as they worked for Trans World Airlines in the early years of commercial aviation. Since his father was an airline captain, Thomas and his siblings got quite an education in geography and culture, as they traveled to many corners of the world.

When Thomas was 11 years old, he told his father he wanted to be a veterinarian. This decision set Thomas’ career in motion, and he gained experience by working as a veterinary technician during his high school and college years. While earning a Bachelor of Science Degree in Biology and Chemistry, Thomas also developed his technical skills and lifelong commitment to caring for pets.

After completing veterinary school in Italy, Thomas completed his post-graduate training at the New York City-based Animal Medical Center. Next, his 12 years of critical care and emergency service work helped him fine-tune his diagnostic, treatment, and surgical abilities. Dr. Beighlie expresses his gratitude to the many veterinarians, professors, and mentors who helped him become an accomplished veterinarian.

Dr Beighlie Examing a Cat After settling in California, Dr. Beighlie’s veterinary practice work included serving as Chief of Staff of the Animal Emergency and Referral Center in Norwalk, California. He felt honored that his facility was asked to handle the routine and emergency care for the region’s police service dogs.

In 2008, Dr. Beighlie and Dr. Mintzer merged their practices, creating All Pets Medical and Surgical Center. Dr. Beighlie strongly feels that both doctors bring special skills and a wealth of experience to the practice. As a result, patients receive more efficient care and experience better outcomes; and pet parents often see reduced treatment costs.Dr Beighlie and friend

Looking back at his 48 years in veterinary medicine, including 34 years as a Doctor of Veterinary Medicine, Dr. Beighlie still loves being an active part of the veterinary profession. He thoroughly enjoys meeting his clients, and absolutely loves caring for their pets.

Dr. Beighlie also stays very busy in his personal life. He enjoys surfing, sailing, racing Go-Karts, and hitting the slopes with his son. Dr. Beighlie’s active life also includes plenty of hiking, cycling, and camping. Photography and history also pique his curiosity. He speaks Italian, French, and Spanish; which adds an extra dimension to his travels abroad.

Dr. Beighlie also believes in giving back to his community. He has helped to lead animal-related disaster relief efforts, served as a lecturer at the Long Beach Police Academy, and volunteered as a Cub Scout leader.

While Dr. Beighlie doesn’t currently have any pets, he’s amused by Foxy, his son’s papillon/miniature pinscher mix. Foxy is intensely jealous of Zeus, her feline housemate. Clearly, Foxy would love to put Zeus in his place. However, Zeus is bigger than Foxy, and she’s smart enough to realize the dangerous consequences of such a move.

We serve the cities of Diamond Bar, West Covina, San Dimas, Phillips Ranch, Via Verde, Hacienda Heights, Glendora, Claremont, Chino, Chino Hills and beyond.

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