Internal Medicine

//Internal Medicine
Internal Medicine2018-06-09T11:55:39+00:00


Veterinary Internal Medicine

You’ll find that your board certified internist may rely on a wide array of tests to ascertain the cause of your pet’s illness – including digital radiography, endoscopy and ultrasound.

With ultrasound, your pet benefits from a painless, non-invasive method of examining internal organs and determining whether further medical action is needed. Used in combination with radiology, it can form a highly-effective means of identifying and treating specific health conditions.

Your pet also benefits from the collective experience and expertise of our assembled veterinary team. When necessary, our internists are supported in making their diagnoses by other pet specialists at Columbia River VetERinary Specialists. Types of cases include:

  • Acute Heart Failure
  • Arrhythmias
  • Cardiac Emergencies
  • Addison’s Disease
  • Intensive Care Monitoring
  • Complicated and Atypical Cushing’s Syndrome
  • Complicated Diabetes Mellitus
  • Chronic and Acute Renal Failure
  • Infectious Gastro-Intestinal Disease
  • Inflammatory Bowel Disease
  • Exocrine Pancreatic Insufficiency
  • Pancreatitis
  • Heptopathy
  • Hemolytic Anemia
  • Hepatitis
  • Systemic Lupus Erythematosus
  • Thrombocytopenia
  • Medical Management of Portosystemic Shunting
  • Chronic Bronchitis
  • Feline Asthma
  • Seizures and Neurologic Emergencies
  • Complicated Thyroid Diseases
  • Diabetes Insipitus
  • Hypo/Hyper Parathyroid

Sarah Guess, DVM, MS, DACVIM

Dr. Sarah Guess is a Pacific Northwest native, originally from Liberty Lake, WA. She graduated from the Washington State University College of Veterinary Medicine in 2012. She went on to complete a one-year internship in small animal medicine and surgery in Mesa, AZ. In 2016, Dr. Guess completed her Small Animal Internal Medicine Residency at Kansas State University and was voted “Resident of the Year” by the senior veterinary students. She also graduated summa cumme laude in May 2016 with a Masters degree in Biomedical Sciences from Kansas State University.

Dr. Guess enjoys  all aspects of internal medicine, and is diligently pursing a board certification in small animal internal medicine. She is especially passionate about acute/chronic kidney disease, geriatric feline and canine medicine, endocrinology, immune mediated disease, infectious disease, and endoscopy.

Dr. Guess truly loves living in the Pacific Northwest. She loves running in her free time, and completed the Portland Marathon in 2014 and the Seattle Half Marathon in 2015. She also enjoys spending time outdoors and at the beach.​

Kristin Schafgans, DVM, DACVIM

Small Animal Internal Medicine
Dr. Schafgans is originally from the San Francisco Bay Area. She received her undergraduate education at the University of California, San Diego. She graduated from University of Minnesota College of Veterinary Medicine in 2008. Following veterinary school, she completed a one year rotating internship in medicine and surgery at VCA West Los Angeles Animal Hospital. She then returned to the University of Minnesota and completed a three year residency and board certification in Small Animal Internal Medicine in 2012. After residency, she worked in a private specialty practice in Spokane, WA before joining the CRVS team in 2018. Dr. Schafgans is a Diplomate of the American College of Veterinary Internal Medicine (DACVIM) and is board certified in small animal internal medicine. While she enjoys all aspects of internal medicine, she particularly enjoys gastrointestinal disease, nutrition, endoscopy, endocrine disease and immune mediated disease. Outside of work, Dr. Schafgans enjoys all things outdoors and being with her husband, two children, two dogs and two cats.