Scott W. Hansen, DVM

Dr. Scott Hansen has been interested in horses since his teens. He first pursued a career as a farrier in Nebraska after attending Oklahoma Farrier College. After being exposed to the equine veterinary medicine world while working for a year, Scott decided to become a veterinarian. He continued to work as a farrier while attending Iowa State University College of Veterinary Medicine until he graduated in 1980. He then moved to the Gresham area and opened a solo equine-only ambulatory practice in 1983, focusing primarily on race horses.

Scott’s interest in lameness and surgery grew while working at the track. He opened his current hospital in 1985 with a surgical facility to be able to provide a higher quality of care for his patients. His practice has grown much larger than he had ever imagined, with its emphasis shifting from racetrack work in the mid 1990s to sport horse and companion animal medicine and surgery.

Scott has remained intrigued by equine medicine by staying up to date with the latest technologies and advances in the field. Throughout his practice life, Scott has found the most rewarding aspect has been the people he has met and the horses he gets to work with everyday. His main interests have been lameness, surgery, farrier science, and diagnostic imaging.

Christy Sandquist, DVM

Dr. Christy Sandquist hails from the beautiful Applegate Valley in Southern Oregon. Horses have always been the center point of her life as an equestrian and in her career.

From a young age Christy relished her time in the saddle, whether it was exploring the beautiful Oregon landscape trail riding and horse camping or preparing for competition. Christy spent a number of years in 4-H, on her high school equestrian team, competing in open horse shows and representing Oregon State University on their intercollegiate equestrian team.

Christy’s professional training began at Oregon State University where she earned her bachelors degree in pre-veterinary medicine and equine sciences. Advancing her career, she then earned her Certified Veterinary Technician license in Oregon. Christy worked for years as a licensed technician in small animal emergency and critical care, small animal specialty surgery and all aspects of equine medicine. With a passion for medicine and to further her education, Christy pushed herself to earn admission into veterinary school. Christy studied at Oregon State University College of Veterinary Medicine and graduated with honors. Thereafter she completed an equine internship at Pioneer Equine Hospital in California. This is where she received advanced training in equine internal medicine, surgery, sports medicine, emergency and critical care, advanced imaging (including digital radiology, ultrasonography, edoscopy, MRI and CT), general anesthesia, dentistry and reproduction. Christy is dedicated to and passionate about all aspects of equine medicine and serving her equine patients in any way she can.

During her free time Christy can be found out enjoying the wonderful outdoors. Her adventures consist of traveling, hiking, camping and spending time with her family and friends.

Paul Duff, DVM

Paul Duff is a native to Columbus, Ohio. He learned to love horses after his family became involved in the cutting horse industry breeding and showing Quarter Horses. After graduating from Iowa State CVM, he completed a 1 year internship at Littleton Equine Medical Center, rotating between surgery, medicine, field, and emergency services. After the internship Dr. Duff returned to Columbus, OH to join Bella Vista Equine Veterinary Services, focusing on the performance horse. Dr. Duff also worked a breeding season in Colorado, focusing on the problem mare, semen processing, and neonatal care. He comes to the northwest excited to join CEH! His interests include reproduction, lameness, surgery, dentistry, and integrative medicine. In the free moments Dr. Duff loves all things outdoors, climbing, hiking, biking, playing music, and enjoying nature with his two dogs, Ellie and Rocky.


  • Undergraduate: Zoology, Miami University 2010
  • Doctor of Veterinary Medicine: Iowa State University College of Veterinary Medicine 2014
  • Internship: Littleton Equine Medical Center 2014-2015
  • Certified Veterinary Medical Acupuncture, CVA
  • Certified Veterinary Chiropractic, IVCA

Mariya Pitel, DVM, MS, DACVIM (LAIM)

Dr. Mariya Pitel spent her childhood in rural Crimea on a family farm nestled between the vineyards and almond groves bordered by the Black Sea. While tending to her herd of goats and watching her aunt, a veterinarian at a large state-owned dairy, she learned to appreciate the bond between animals and their people. When later Dr. Pitel moved to California, she found herself right at home, surrounded by vineyards, ranches, and fruit orchards. Dr. Pitel earned both her BS and DVM degrees from UC Davis and spent a year as an intern veterinarian at Pacific Crest Equine before pursuing a residency in large animal internal medicine at Oregon State University. Following a year working as a staff veterinarian back at UC Davis, Dr. Pitel joined the AIM Team in Penngrove, CA, where she incorporated sports medicine. Dr. Pitel is a large animal internal medicine specialist, board certified by The American College of Veterinary Internal Medicine. Her professional interests include gastrointestinal disease, rehabilitation, acupuncture and nutrition.
In her spare time Dr. Pitel enjoys hiking and exploring the trails of the beautiful Oregon mountains with her dog Mishka, as well as riding (and soon driving) her horse Rudy.


  • Undergraduate: Neurobiology, Physiology and Behavior, UC Davis 2010
  • Doctor of Veterinary Medicine: UC Davis College of Veterinary Medicine 2015
  • Internship: Pacific Crest Equine 2015-2016
  • Large Animal Internal Medicine Residency: Oregon State University College of Veterinary Medicine 2016-2019
  • Certified Veterinary Medical Acupuncture, cVMA

Lauren Taylor, DVM

A Bay Area native, Dr. Lauren Taylor grew up as a Portola Valley Pony Club member and an avid competitor in the Northern California hunter/jumper circuit. Lauren received both her BS and DVM degrees from the University of California, Davis. Following graduation, she began a sports medicine internship under Dr. Duncan Peters at East-West Equine Sports Medicine in Lexington, Kentucky. During that year, she acted as an official veterinarian at the National Sunshine Series and Desert Circuit (Desert International Horse Park) in California, as well as the Great Lakes Equestrian Festival in Michigan. Lauren is an FEI permitted treating veterinarian and an active member of the International Society of Equine Locomotor Pathology (ISELP). Her primary interests include equine sports medicine and diagnostic imaging. In her free time, Lauren enjoys hiking, boxing, and spending time with her dog (Memphis) and bunnies (Camomile and Bear).


  • Undergraduate: Animal Science, UC Davis 2015
  • Doctor of Veterinary Medicine: UC Davis College of Veterinary Medicine 2019
  • Internship: East-West Equine Sports Medicine 2019-2020

David O. Klugh, DVM

Dr. Dave Klugh graduated from Washington State University College of Veterinary Medicine in 1981. After five years of mixed practice, he and his wife purchased an exclusive equine practice in Newberg, Oregon, in 1986. Dave’s interest in equine dentistry led him to become certified at all three levels of expertise (basic, advanced, and examiner) by the International Association of Equine Dentistry (IAED), where he currently assists in oversight of all certification procedures as a member of IAED’s Certification Committee.

In 2003, he became the first Equine Fellow in the Academy of Veterinary Dentistry, laying the groundwork for further elevation of equine dentistry to the level of a specialty in veterinary medicine.

Paul Scherlie, DVM, Diplomate, AVCO

Consulting Veterinarian

Dr. Scherlie graduated from UC Davis School of Veterinary Medicine in 1985 and completed a

residency in veterinary ophthalmology from the New York State College of Veterinary Medicine in 1991. He has practiced in the Portland Metropolitan area since 1992.

Megan Cormack, Practice Manager


Megan is a Portland local who joined the practice in 2006. She grew up riding and showing Tennessee Walking Horses. Currently, she enjoys managing her small farm in Eagle Creek with her husband and young daughter Ava. They have two dogs, Suki and Zoe, two Tennessee Walkers, Kojak and Penny, and a whole gaggle of chickens. Megan spends her free time hiking and camping with her family, gardening, playing in the kitchen with her daughter and riding.

Tia Garcia, Front Office


Tia joined the Columbia Equine team in 2021.  Tia is an Oregonian that grew up loving horses, and currently owns Winter, a lovable Arabian.








Michelle Kazmierowicz, Front Office


Michelle is an Oregon native who joined the Columbia Equine team in 2016. She grew up riding and showing horses in the Portland area. When she is not helping out around the practice she can be found with her Quarter Horse mare Callie chasing cows and trying their hand at reining.







Mallorie Zabst, Head Veterinary Assistant

Mallorie was born and raised in Las Vegas, NV. She started riding horses at a young age in multiple disciplines and competing in local club shows. Mallorie went to college at New Mexico State University where she was a part of the NCAA Equestrian Team riding hunt seat as well as an instructor for the NMSU Therapeutic Riding Program. She graduated in the spring of 2011 and received her bachelor’s degree in Animal Science with an emphasis in Equine Management.

Mallorie moved to the PNW after college with her husband Kyle, her huskies, and her quarter horse mare Hallie. She has enjoyed planting roots here in Oregon and raising her daughters Audrie and Charlotte to be animal lovers just like their mom. She has been a part of the Columbia Equine team since March 2012.




Jenna Black, Veterinary Assistant

Jenna joined the Columbia Equine team in 2020.  Jenna grew up in Oregon and has been riding horses since she could walk! Once she learned the basics and earned the right to go faster than a walk/trot I discovered my passion was timed events and started gaming and barrel racing.  She has also dabbled a bit in reined cow horse events and is passionate about educating herself to be the best rider she can be to my horses.  When she is not at the clinic, she is either spending time riding and training her own horses Cardi and Suzie, spending time with friends and family, enjoying the outdoors, or working on classes for her BS in Equine Animal Science.




Josue Mendoza, Veterinary Assistant

Josue joined the Columbia Equine team in 2021.









Kat Abel, Veterinary Assistant

Kat joined Columbia Equine in March of 2021 a few days after a 3000+ mile trip across the US from Florida. In Florida, Kat had been working at an equine hospital, but longed to return to the Pacific Northwest and hoped she would be able to stay in the field. In addition to working as a veterinary technician, Kat has many years of experience as an FEI groom and horse farm manager.

Kat lives in Portland with her two cats, Pod and Oslo, and tarantula named Judy. She enjoys long distance backpacking, hiking, riding endurance horses, creating art, and writing letters.