Doctors & Staff

Employee of the Month

In her many years here she has gone over and beyond what any employee has done and has never been recognized for it. She cleans the clinic, she takes care of the dogs, she performs treatments and she ...

Our Doctors

Dr. Cindy Yao

Dr. Cindy Yao

I live in Stockton with my husband Brian, our Dachshund, Goose, and our Calico cat, Tuna.

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Dr. Marlena Cleary

Dr. Marlena Cleary

Hello! I’m Dr. Marlena Cleary. I am very excited to meet you and provide excellent care for your pet.

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Dr. Sydney Gillam

Dr. Sydney Gillam

Hello, I’m Dr. Sydney Gillam and I am so excited to be a part of the Sierra Veterinary Family.

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Our Veterinary Technicians

Jenee Giottonini

Jenee Giottonini

Hi, my name is Jenee. I started working here at Sierra while attending school to become a Registered Veterinary Technician.

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Jennifer Wang

Jennifer Wang

Hello, my name is Jennifer and I have always had a soft spot for animals, which is why I am currently working towards a career in the animal field.

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Megan Jumanan

Megan Jumanan

Hello, my name’s Megan and I live with my two dogs, Nemo and Tyson.

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Anna Peck

Anna Peck

Hello, my name is Anna Peck and I was born and raised here in Stockton.

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Katie Estoll

Katie Estoll

Hi, my name is Katie Estoll and my husband is Buddy Estoll.

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Our Hospital Administrators

Tiffini Clark

Ms. Clark brings over 20 years' Operation’s and Management experience to Sierra Veterinary Clinic.

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Brenda Dockery

Brenda Dockery

Hi. My name is Brenda and I have been here at Sierra Veterinary Clinic since October 2005.

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Veterinary Assistants

Ashley Pattingale

Ashley Pattingale

Hi, I’m Ashley Pattingale and I joined the staff at Sierra Veterinary Clinic in March of 2017.

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Carol Brighton

Carol Brighton

Hi, my name is Carol Brighton. I grew up on a farm on Roberts Island.

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Front Desk

Alexis Preciado

Alexis Preciado

Hello, my name is Alexis and I have been at Sierra Veterinary Clinic since April 2015.

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With the recent shelter-in-place order issued for our community, we wanted to take a moment to let you know that we are open and here for you and your pet!

However with the safety of our clients, patients and employees in mind, our lobby will be closed until further notice. Veterinary services will remain available during our normal business hours with a few adjustments to how we receive you and your pet, including:

Appointments & Medication/Food Pickup

Upon arriving at the clinic, please remain in your vehicle and contact us via phone @ 209-477-4841 to let our team know you have arrived. A team member will then meet you at your vehicle to escort your pet inside for the appointment and/or deliver any products you need to pick up. Payments can be made over the phone, from your vehicle.

We ask that no one who is experiencing flu-like symptoms or who has been exposed to someone who has tested positive for the COVID-19 virus enter the facility at this time.

Refill Requests

To submit a medication or food refill request, please contact us via phone, email or online refill request form. We will contact you when your refill is ready and deliver it to your vehicle upon your arrival.


Thank you for your patience and understanding, and for helping us keep our community safe!

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