Kristin Lewis, DVM, MS, DACVIM (SAIM)

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Dr. Kristin Lewis

Board-Certified Small Animal Internal Medicine Specialist

Dr. Kristin Lewis is a board-certified small animal internal medicine specialist in San Antonio. She is based out of Shavano Park and is available to serve general practices and emergency animal hospitals throughout her service area in the San Antonio metropolitan region.


A Texas native, Dr. Kristin Lewis graduated cum laude from Rice University with a Bachelor of Arts degree in 2002. She went on to earn her Doctor of Veterinary Medicine degree from Texas A&M University in 2006, and then completed a one-year rotating internship in small animal medicine and surgery at Kansas State University. Following her internship, Dr. Lewis spent two years in clinical practice as an associate veterinarian in Sugar Land, TX, but in 2009 she embarked on a dual program at the University of Missouri to complete her small animal internal medicine residency and earn a Master of Science degree in biomedical science. She earned her certification and became a Diplomate of the American College of Veterinary Internal Medicine in 2012.

For the next seven years, Dr. Lewis provided small animal internal medicine services to the community of San Antonio, Texas. During this time she also served as Co-Director of the internship program, assisting in the training and development of young veterinarians. She left clinical practice for a short period of time and provided consulting service prior to joining MOVES in January of 2023.

In addition to comprehensive ultrasound services and minimally invasive procedures, Dr. Lewis has a particular interest in gastrointestinal, hepatobiliary, and infectious diseases as well as endocrine disorders. Outside of work, Dr. Lewis shares her life with her husband, two children, and three dogs (an English Setter and two Cavalier King Charles Spaniels). In her spare time, she enjoys camping, remodeling/home improvement, family, and has dubbed herself a Cavalier King Charles enthusiast.


  • 2023
    Joined MOVES
  • 2012-2022
    Clinical practice in San Antonio, TX and industry consulting services.
  • 2012
    Completed Small Animal Internal Medicine Residency and Master of Science in Biomedical Science at University of Missouri College of Veterinary Medicine; achieved board certification in Small Animal Internal Medicine
  • 2007-2009
    Clinical practice in Sugar Land, TX
  • 2007
    Completed small animal internship at Kansas State University College of Veterinary Medicine.
  • 2006
    Earned DVM from Texas A&M University.
  • 2002
    Graduated from Rice University with a Bachelor of Arts degree.

Niedzwecki AH, Book BP, Lewis KM, Estep JS, Hagan J (2017). Effects of oral 3% hydrogen peroxide used as an emetic on the gastroduodenal mucosa of healthy dogs. Journal of Veterinary Emergency and Critical Care, 27(2):178-184.

Lewis KM, Cohn LA, Marr HS, Birkenheuer AJ (2014). Failure of efficacy and adverse events associated with dose-intense diminazene diaceturate treatment of chronic Cytauxzoon felis infection in five cats. Journal Feline Medicine and Surgery, 16(2):157-63.

Lewis KM, Cohn LA, Marr HS, Birkenheuer AJ (2012). Diminazene diaceturate for treatment of chronic Cytauxzoon felis parasitemia in naturally infected cats. Journal of Veterinary Internal Medicine, 26(6):1490-3.

Lewis KM, Cohn LA, Downey ME, Whitney MS, Birkenheuer AJ (2012). Evaluation of Cytauxzoon felis infection status in captive-born wild felids housed in an area endemic for the pathogen. Journal of the American Veterinary Medical Association; 241(8):1088-92.

Lewis KM, Cohn LA, Birkenheuer AJ (2012). Lack of evidence for perinatal transmission of Cytauxzoon felis in domestic cats. Veterinary Parasitology,188(1-2):172-4.

Lewis KM, Cohn LA, Birkenheuer AJ, Papich MG (2012). Pharmacokinetics of Diminazene Diaceturate in Healthy Cats. Journal of Veterinary Pharmacology and Therapeutics, 35(6):608-10.

Cohn, L., Lewis, K., (2011). Immunosuppressive drug therapy, In:  Little, S. (Ed.) The Cat: Clinical Medicine and Management. Elsiever, St. Louis.

Lewis, KM, O’Brien, R (2010). Abdominal Ultrasonographic Findings Associated With Feline Infectious Peritonitis: A Retrospective Review of 16 Cases. Journal of American Animal Hospital Association, 46 (3), 152-160

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    Dr. Kristin Lewis

    What is a board-certified veterinary internal medicine specialist?

    A veterinary internal medicine specialist is a veterinarian who has completed advanced training in internal medicine (including a one-year internship and three-year residency) following graduation from their veterinary college. The residency training culminates with a comprehensive examination covering all aspects of veterinary small animal internal medicine. Once these requirements have been fulfilled, the veterinarian is considered to be a Diplomate of the American College of Veterinary Internal Medicine (ACVIM).

    The umbrella of small animal internal medicine includes many sub-disciplines including gastroenterology (esophageal, stomach and intestinal disease), hepatology (liver and pancreatic disease), endocrinology (hormonal disease), infectious diseases, urology (urinary tract disease), nephrology (kidney disease), respiratory medicine (nose, airway and lung disease), and hematology (blood cells) & immunology (immune diseases). In many cases, the signs of a patient may include many of these organ systems. Due to their holistic approach, internal medicine specialists may also manage cases of patients with neurologic, cardiovascular or cancerous diseases, especially when these patients also share diseases within the scope of internal medicine.

    Adapted from “What is a Board-Certified Veterinary Internal Medicine Specialist?” on