Meet Our Doctors


Andrew Grange, BSc (Hons), BVetMed, Diplomate ACVS

Dr. Andrew Grange is a Diplomate of the American College of Veterinary Surgeons, and Chief of Staff of OakVet Animal Specialty Hospital. He attended University College London where he received his bachelor's degree in orthopedic science, and then graduated in 2008 from the Royal Veterinary College in London with a degree in veterinary medicine. Following graduation he completed a rotating internship in Southern California, and a residency in small animal surgery at Angell Animal Medical Center in Boston, MA. 

His professional interests include the application of minimally invasive surgical techniques (Arthroscopy, Laparoscopy, and Thoracoscopy) in the management of soft tissue and orthopedic disease, and the surgical treatment of cruciate disease, fractures, and Total Hip Replacement. 

Dr. Grange's personal interests include skiing, cycling, ice hockey, and spending time with his wife, Allison (also a veterinarian), children Amelia and Ethan, their dog, Abby, and 5 cats.

Jamie Wignall, BVetMed (Hons), MS, Diplomate ACVS


Dr. Wignall comes from a family of veterinarians in the United Kingdom, and after pursuing veterinary school at the Royal Veterinary College in London, he returned home for a year in rural mixed animal practice. Adventure beckoned, and he completed his surgical training at Louisiana State University where he found a southern girl, a love for the New Orleans Saints and a terrier called Maverick. He then worked in Southern California for 4 years where the family expanded to add two more terriers, Biffy and Ziggy. His hobbies include snowboarding, soccer, hiking and spending time with his partner, Luli, also a veterinarian.

His professional interests cover all aspects of orthopedics, soft tissue, and neurosurgery, with a particular emphasis on the upper airway and minimally invasive surgery. Practice management has become a new interest and he is studying towards a Masters in Business Administration.

John Haburjak, DVM, Diplomate ACVS

Dr. John Haburjak graduated from UC Davis Veterinary School in 1993 with his Doctor of Veterinary Medicine Degree. He practiced for 5 years before returning to academics to complete a combined surgical residency program in San Diego and the University of Illinois.

Dr. Haburjak is a Diplomate of the American College of Veterinary Surgeons his clinical surgical interests include surgical oncologic procedures of the face, head and neck, corrective orthopedic procedures, and disorders of the canine stifle. Finally, he has dedicated most of his post-graduate emphasis on minimally invasive procedures including: laparoscopy, thoracoscopy and interventional radiology (urethral and tracheal stenting).

Dr. Haburjak’s hobbies include singles tennis, Oakland A’s baseball, riding with his kids and cooking (not to mention eating, too!). He shares his life with his wife, Aimee (also a veterinarian), daughters Eva & Emery and sons Ian, and Isaac – along with Addison (bubble-headed Japanese spaniel), Poppy (a Cavalier King Charles Spaniel with a freckled nose!), Pixie (mutant Chihuahua) – some Guinea Pigs and a Cat named Ginger Cookie.

Internal Medicine

Benjamin Polansky, DVM, Diplomate ACVIM

Dr. Polansky is originally from Boston, MA where he earned his degree in Veterinary Medicine from Tufts University. It was during his internship at Louisiana State University School of Veterinary Medicine where he discovered a keen interest in the internal medicine specialty. He continued his training with an Internal Medicine residency at MedVet Medical and Cancer Center for Pets in Columbus, Ohio. Upon completion of his residency, he practiced at a high volume speciality hospital in southern California for the past four years.  Now Dr. Polansky is extremely excited for the opportunity to be part of the Oak Vet family. He has a particular interest in immune-mediated and gastrointestinal diseases, he values the human-animal bond, and is passionate in preserving and strengthening that relationship through medical intervention. 

As an active, outdoor lifestyle enthusiast Dr. Polansky enjoys hiking, running, and working out. He also loves exploring the area and spending time with his wife and daughter, as well as his two dachshunds. True to his northeast coast roots, he is an avid New England Patriots fan (Go Pats!).


Justin Williams, DVM, Diplomate ACVIM/Cardiology


Dr. Justin Williams completed his undergraduate degree at the University of California at Los Angeles before obtaining his veterinary medical degree in 2007 from Colorado State University.  He then completed an internship in small animal medicine and surgery at Wheat Ridge Animal Hospital in the Denver metropolitan area.  Dr. Williams finished a three-year cardiology residency at the MSPCA Angell Animal Medical Center in Boston, and earned board certification in cardiology from the American College of Veterinary Internal Medicine in 2011. Originally from Arizona, he enjoys the outdoors alongside his wife, Emily, and their three children. His hobbies include fly-fishing, hiking, photography, drawing, and ice hockey.

Emergency & Critical Care 

Danielle Pollio DVM, Diplomate ACVECC

Dr. Danielle Pollio graduated magna cum laude from the University of Georgia College of Veterinary Medicine in 2012. After veterinary school, Dr. Pollio completed a small animal rotating internship at Red Bank Veterinary Hospital and went on to pursue a three-year residency in emergency and critical care medicine at BluePearl Veterinary Partners in Tampa, Florida. She practiced at a large specialty hospital in the Pacific Northwest until moving to the Bay Area in 2020. Dr. Pollio is passionate about all aspects of emergency and critical care medicine and is particularly interested the treatment of polytrauma and sepsis. In her free time, Dr. Pollio enjoys jogging around Lake Merritt, baking for coworkers, and spending time with her husband and pets.

Erin Updegrove, DVM

Dr. Erin Updegrove graduated from the UC Davis School of Veterinary Medicine and pursued an emergency-focused internship outside of Washington, D.C. She has been practicing emergency medicine in the Bay Area since 2011. Outside of the ER, she is passionate about volunteering her time to underserved communities across the United States and internationally. Dr. Updegrove works with several organizations that provide free veterinary care for the public, as well as training for new graduate veterinarians and students. In her spare time, she enjoys gardening, hiking, and enjoying the Bay Area while sharing her home with an energetic pit bull named Riza.

Caroline Li, DVM

Dr. Caroline Li graduated from Ross University School of Veterinary Medicine and completed her clinical year at Oklahoma State University. She completed a small animal rotating internship at East Bay Veterinary Specialists and Emergency in Walnut Creek and has practiced in the San Francisco Bay Area since 2013, ranging from general practice, emergency and high volume spay neuter. Dr. Li has come full circle and returned to one of her first passions in emergency medicine and is proud to serve the Oakland/East Bay community. Outside of work she enjoys outdoor activities ranging from cross country skiing to training for triathlons. She shares her home with her "coconut retriever" Daphne and is owned by her two young cats Owl and Klay.   

Rachael Worden, DVM 


Dr. Rachael Worden graduated from Auburn University College of Veterinary Medicine. After graduation she decided to follow her dream of moving to the West Coast and left her hometown in Northern Kentucky to pursue a small animal rotating internship in San Jose. During her internship she developed a passion for emergency medicine and elected to stay an additional year to complete an emergency focused internship. Dr. Worden recently moved to the East Bay to be closer to the city and surrounding microclimates. Dr. Worden is excited to continue practicing emergency medicine at Oakvet Animal Specialty Hospital and treat the pets of the Oakland/Bay area community. Outside of work she enjoys live music, snowboarding, hiking with her dog Milo, and exploring Northern California.

Amy VanLishout, DVM 


Dr. Amy VanLishout grew up in North Dakota and completed her undergraduate degree at Washington University in St. Louis. She attended veterinary school at Colorado State University then completed an Emergency and Critical Care internship at DoveLewis Emergency Animal Hospital in Portland. She has enjoyed practicing emergency medicine and living in the Bay Area over the past few years. Amy loves trail running in the Berkeley hills and spending time with her partner and their two pitbulls BoogieMan and Eddie. 

OakVet Animal Specialty Hospital Inc.

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ph. 510-879-4888 | fax 510-905-0044

1133 7th St, Oakland, CA, 94607