About Us, Animal Hospital of Walnut

The bond between you and your pet is as powerful as any intimate relationship you experience. Your pet depends on you to maintain a healthy and enjoyable life. Dedicated and loyal pet owners turn to the Animal Hospital of Walnut for help with these important responsibilities.

Helping Pets since 1981

Dr. Damon Goldstein founded the

Animal Hospital of Walnut

in 1981 to offer exceptional care to dogs and cats in Walnut, Diamond Bar, Chino Hills, Phillips Ranch and the surrounding areas. Dr. Mintzer is the current owner of the hospital. He has worked in the area since 1995 and is committed to maintaining the high standards which have made Animal Hospital of Walnut a

trusted pet care facility.

You'll still be seeing many of the same friendly, happy faces at each visit
Staff at Animal Hospital of Walnut

We know just how you feel about your dog or cat. For

routine wellness care,

or in times of illness or injury, no one is more dedicated to giving your pet a long and healthy life than our experienced and compassionate Veterinarians: Patricia Colley, DVM, MPVM, Karen Smolen, DVM, Charles Mintzer, DVM and our equally caring and friendly Staff.

We are proud to be accredited by the

American Animal Hospital Association,

which sets the

highest standards for Veterinary Hospitals and Practices.

We hold ourselves to these standards and are constantly increasing our knowledge and skills. Our team of Doctors, Technicians, Receptionists, and Managers work together to create a unique environment for our clients and their pets. It has always been and will continue to be our tradition to provide excellent veterinary medical care.

We are passionate about the care we provide and value the trust and loyalty our clients place in us.

Cat Friendly Animal Hospital

We Offer in-house Pet Diagnostics

We Accept Major Credit Cards We Accept Care Credit

Pet Care Payment Plans

Download Our Mobile App
Vet Surgery
In-House Payment Plans

American Veterinary Medical AssociationAmerican Animal Hospital AssociationAmerican Board of Veterinarian PractionersSouthern California Veterinary Medical AssociationCalifornia Veterinary Medical Asociation


The Animal Hospital of Walnut provides veterinary services throughout the Walnut Valley cities of Diamond Bar, La Puente, San Dimas, Phillips Ranch, West Covina, Pomona, La Puente, and beyond.




"This year must have been the most times a went to the vet. First a skunk bite and a chicken bone incident and now a broken foot. The nurses are always so nice when replacing Bobby's Splint(6 or 7 time) and accepting him on every short notice. Even though he's truly a energentic and trouble making dog the staff is truly patience and kind and does quick work on splinting. But always make sure you call ahead cause it can be a bit crowded." —Tammy P., Walnut, CA via Yelp 3/12/2017

"I brought my pup Ratchet here because I noticed blood in his urine. The staff was absolutely amazing. They are very friendly and knowledgeable. The Dr. suggested X-Rays to check for any serious issues. He explained everything to me (what and why) and let me make all the decisions instead of just doing everything on his own and dropping the bill in my lap like most places would. I am very pleased with my visit. Before we left, Ratchet was groomed. He absolutely loves Amy! He perks up when she comes in the room, it's adorable. She does an amazing job with him. They always go above and beyond my expectations. Highly recommended!." —H R., Upland via Yelp

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