Our Veterinarians

Dr. Susan Olivas
Owner, Veterinarian
By the time she was 12, Susan had grown too tall to be a jockey. She considered what else she could do with her love of animals and her scholastic abilities, and a career as a veterinarian was the perfect answer! From then on she focused on becoming a veterinary professional.

Dr. Olivas attended the University of California Davis to obtain her Bachelor’s in Animal Science. After working at the University’s Teaching and Research Facility, she was accepted into the School of Veterinary Medicine, where she chose the Large Animal Medicine tract. After graduating in 1989, she focused on Equine medicine for the first 10 years of her career. When she was ready to start a family with her husband Mike, she switched to small-animal medicine and has been working in that field for the past 20 years. In 2012, she purchased Ceres Veterinary Clinic.

Dr. Olivas’s family consists of her husband and their three boys, Aaron, Daniel, and Jacob, who are involved in soccer and basketball. The family also has three cats, two horses, an assortment of chickens, sheep, and their newest addition is an Australian Cattle Dog named Happy.

As a busy working mother, Susan’s spare time is spent following her children’s sports and hobbies. When she does get a few moments to herself, she likes reading and going on walks.
Dr. Ingrid Judge
Veterinarian
Dr. Ingrid Judge is a graduate of the UC Davis School of Veterinary Medicine. Dr. Judge first became interested in emergency medicine while completing her PhD degree in Comparative Pathology at UC Davis. Dr. Judge trained in emergency medicine in the West Los Angeles area and then worked in a Level 1 emergency facility for many years. Dr. Judge enjoys spending her spare time with her family on a cattle ranch in the Sierra foothills.
Dr. Erin Cassiday
Associate Veterinarian
Erin Cassiday’s veterinary medicine career path began when she was six years old. Even at that young age, young Erin was virtually certain she wanted to become a veterinarian someday. To get a taste of the profession, Erin happily accompanied her equine veterinarian on local farm calls, and those experiences cemented her desire to work with animals. Today, Dr. Erin Cassiday has achieved her childhood veterinary medicine goal. She loves helping her furry patients to live longer, healthier lives with their pet parents!

Erin spent her early childhood in Florida with her sister and mother, and moved to Arizona when she was 11 years old. A confirmed animal lover, Erin acquired cats, dogs, horses, a pot-bellied pig, and birds as her companions. Her family’s property also contained numerous cattle and buffalo. When the family veterinarian visited Erin’s farm to examine and treat the animals, Erin often “played veterinarian” right along with him. She also “rescued” numerous animals who seemed like they needed a helping hand. Erin’s veterinary medicine dream was still very much alive.

After Erin graduated from high school, she attended Arizona State University, majoring in both biology and agribusiness. After her graduation, Erin entered veterinary school, and after much hard work graduated in the top 15 percent of her class. Dr. Cassiday credits her family and friends, along with her former equine veterinary mentor, for encouraging her to achieve the career she had dreamed about.

With her Doctorate of Veterinary Medicine in hand, Dr. Erin Cassiday joined a mixed animal practice, a hectic job that required many on-call emergency shifts. Desiring a more normal schedule, Dr. Cassiday joined the Ceres Veterinary Clinic care team in April 2014. She loves helping her clients to keep their pets healthy; and she also enjoys using her diagnostic tools and treatments to resolve her furry patients’ medical problems.

Away from the hospital, Dr. Cassiday and her boyfriend, Ronny, enjoy camping with his large family. The couple also indulges their love for good food and wine on frequent trips to the California coast. Dr. Cassiday thrives on travel to new places, and she often seeks ways to share her veterinary medicine knowledge at her destination. Most recently, she traveled to Nicaragua with World Vets, teaching veterinary students valuable surgical and general medicine skills while also helping to care for residents’ animals.

Dr. Cassiday also shares her home with two much-loved furry family members. In 2017, she rescued Mr. Moustachio, a handsome but playful cat who has a very distinctive moustache. He fit right in with the family and loves his dog “sister” Hallie. Hallie, a Queensland Heeler with a hobby of “stalking” people through the house, provides great entertainment for Dr. Cassiday and Ronny. While Hallie has her playful side, she has also helped to save several animals’ lives as a canine blood donor.
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    • Vicki RayVicki Ray

      Absolutely love Ceres Vet Clinic! Dr. Bettencourt and his whole staff are awesome! I have 4 furry babies ranging from 11 yrs. to 4 months old and I would never even consider taking them anywhere else. I just moved from Ceres to Stockton and even though the drive is longer, it is worth it. Lots of love and care is what you get at Ceres Veterinary Clinic and I highly recommend it!

    • Machelle ChristensenMachelle Christensen

      Dr. Cassidy is awesome!! I wouldn’t take my babies anywhere else!! The staff is friendly, compassionate and always greats you with a smile.

    • Collins-Juarez DeborahCollins-Juarez Deborah

      We took our Nemo to Ceres Vet with a friends recommendation . So glad we made that choice. Very courteous and friendly not to mention how informational Dr Bettencourt was to us!

    • Leslie TaylorLeslie Taylor

      Best vet around. Wonderful, caring staff, and doctors are great!

    • Terry L. EvansTerry L. Evans

      The staff is very friendly and helpful. They are all so kind and care about their customers, both 2 and four legged ones! Lol! Dr Judge is always very patient and thorough with the animals. We drive from Oakdale to see Dr Judge in Ceres. It's an hour round trip to come to the Ceres Veterinary Group. Not to mention the wait time and then office visit. They are worth it. Sadie and Bear say thank you for helping take such good care of them.

    • Mj M.Mj M.

      Ceres Veterinary clinic is a classy, well run place with a wonderful team of staff and Veterinarians. They work well together, are up to date on new drug...

    • Bennie BacaBennie Baca

      Great Vets, great techs and front desk staff