Staff

Dr. Josh Ettlin earned his Doctor of Veterinary Medicine (DVM) degree at the University of California, Davis.  Most mornings you will find Dr. Ettlin working at local area farms and ranches. He has a passion for working with livestock as he spent the earliest part of his career working predominantly on large cattle ranches and dairy farms. However, sheep, goats, and pigs are also some of his favorite animals to work on. When Dr. Ettlin is not in the field, he takes pride in caring for the dogs and cats in the community. In the fall of 2018, Dr. Ettlin started Sierra Oaks Veterinary Services with a vision of starting a community centered practice that served the needs of both small and large animals.

Dr. Ettlin is a 5th generation native of Nevada County dating back to the 1800's. He most enjoys spending time with his family; his beautiful wife, Kaytie, and four children Paisley, Jaedyn, Quinci, and Bryson. Outside of family time, Dr. Ettlin is an avid outdoorsman. The family also has a small farm with sheep, goats and chickens that keep him busy. He is a big supporter of 4-H, FFA, and the local agricultural community.

Since she was 3 years old, Dr. Byers always wanted to be a Veterinarian. She started working in a vet clinic at the age of 15 through the local ROP (Regional Occupational Program). Eventually she was hired and became a vet assistant/technician. After High school she went to Sierra College and then transferred to UC Davis to finish her bachelor's degree in Animal Biology. She was then accepted at St. George’s University College of Veterinary Medicine were she lived on the small island of Grenada. Her final year of vet school was completed at Oregon State University. After obtaining her DVM from SGU, Dr. Liz returned to her hometown of Grass Valley as a small animal practitioner.Dr. Liz has interest in cardiology, anesthesiology, clinical pathology and small animal surgery. 

Dr. Liz loves being a veterinarian and even on her days off always seems to be doing something animal related. Both Dr. Liz and her husband Cam were competetive dog sled mushers and enjoy playing with their three Northern breed dogs (Diesel, Neya and Maverick). Their hobbies also include skiing, traveling the world,  and wake surfing.  

Dr. Fossum was born and raised in Southern California. She completed her undergraduate
education at the University of California, Davis, graduating with a Bachelor of Science in
Zoology in 1975. She returned to UC Davis, earning her Doctor of Veterinary Medicine in
1981.
After being involved for several years in small animal practice in the Glendale area of So.
California, Dr. Fossum relocated to Nevada County in 1988. Dr. Fossum worked for many
years in general practice in Auburn and Grass Valley prior to joining Pleasant Valley Veterinary
Center (Now Sierra Oaks Vet) in 2016. Her professional interests include preventive care, feline medicine, behavior,
dermatology, and low stress handling. She enjoys client education and encouraging positive
interactions that enhance the human animal bond. Dr. Fossum is grateful for the opportunity to
provide compassionate care and to learn from her patients, who have so much to teach.
In her spare time away from veterinary medicine, Dr. Fossum enjoys spending time with her
four dogs and three cats. She also enjoys gardening, music, and participating in K-9 Nose
Work with Munch, her Norwich terrier and Clover, her Shih Tzu mix.

Dr. Corey Harms grew up in Southern California among the orange orchards. He attended veterinary school at the University of California, Davis, where he graduated with honors. After veterinary school, Dr. Harms completed an internship at Loomis Basin Equine Medical Center, then stayed on as an associate and practiced in the Penn Valley area for a number of years.

Dr. Harms joined Sierra Oaks in 2022 as chief of Equine Services. Professionally, Dr. Harms enjoys the wide variety of general equine practice, and finds special interest in wound management and the early diagnosis and treatment of disease.  He is also involved in endurance rides, rodeos, and horse shows in Northern California.

Dr. Harms lives with his wife, Rebecca, and three children in Penn Valley, where they enjoy the wonderful community and natural beauty of Nevada County. He enjoys camping and hiking with his family, spending time with his horse and dog, playing music, exploring the Sierras by motorcycle, and tinkering in the garage.

Dr. Phoebe Weaver is an Arizona native who came to love Northern California while she attended veterinary school at University of California, Davis. After graduating in 2021, Dr. Weaver initially went back to Arizona to practice veterinary medicine before starting at Sierra Oaks as a small animal practitioner in 2022. Feline medicine is her passion, and she also really enjoys dermatology and internal medicine. She has a great interest in the human-animal bond and loves to share this with others.

Dr. Weaver lives in Grass Valley with her husband, Josh, and two cats, Sterling and Felix. She enjoys hiking, paddle boarding, and skiing, and loves the outdoor opportunities Nevada County has to offer. She and her husband are also avid Phoenix Suns basketball fans. 

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Caitlin was raised in Truckee, CA. She received her bachelor's degree in Animal Science from Cal Poly, San Luis Obispo in 2007. She joined the team at Pleasant Valley Veterinary Center in 2007 and has continued on to join Sierra Oaks Veterinary Services. She received her Registered Veterinary Technician license in 2015 after completing a program through Veterinary Allied Staff Education. 
 

Caitlin lives with her family on a small ranch in Penn Valley. In her free time she enjoys spending time with family and her border collies, running, hiking, riding horses, and running a small commercial cow herd.

Erin Wyatt was born and raised in Penn Valley. During her senior year of high school, she went through the 49er Regional Occupational Program (R.O.P.). After graduating high school she started to work with a local equine veterinarian as a veterinary assistant. While working as a veterinary assistant, she attended Sierra College, were she graduated with an Assosicate of Science Degree in Sustainable Agriculture, Natural Science, and Social and Behavioral Sciences. In July of 2017 she started working for Pleasant Valley Veterinary Center now Sierra Oaks Veterinary Services. In 2019, she continued her education to become a Registered Veterinary Technician (RVT). She received her RVT license in 2020. She has three dogs (Ranger, Reba, and Rooster), a horse (Albert), and a bird (Marley). In her spare time she enjoys spending time outdoors, fishing, kayaking, riding horses and dirtbikes, along with spending time with her family and friends.

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