Temporary Hours: We are currently open 7:00 am-6:00 pm, 7 days a week.

We are committed to caring for your pet – while maintaining the highest level of safety for our Associates and pet owners. We thank you for your continued patience and support. Learn more about our COVID-19 response and guidelines.

Our veterinary internist has obtained substantial additional training through an intensive internship and residency program in small animal veterinary medicine. This provides an extensive understanding how your pet's internal body systems function and in diagnosing and treating the many serious diseases that can affect the health of those systems. An internal medicine specialist has advanced training in the following disciplines:

  • Abdominal & Cardiac Ultrasound
  • Bone marrow aspirate and core biopsy
  • Advanced Imaging (incl. ultrasound, digital radiography and CT Scans)
  • Endocrinology 
  • Cardiology
  • Gastroenterology
  • Hematology (study of the blood)
  • Immunology
  • Infectious Diseases
  • Nephrology/Urology
  • Neurology
  • Respiratory Diseases
  • Oncology

While your general practitioner veterinarian can diagnose and treat many health problems, certain diseases and conditions require the care of a doctor who has had specialized, intensive training in internal medicine in order to provide the very best outcome for your pet.

*Within the discipline of veterinary internal medicine, there are also veterinarians who specialize further in Small Animal Medicine, Cardiology, Neurology, and Oncology.

See our departments

Internal Medicine

Internal medicine is practiced by internists, or doctors that specialize in the treatment, diagnosis and prevention of most diseases that are not surgical in nature. Thus, as in human medicine, internists can be called a "doctor's doctor" due to the fact that they tend to specialize in patients with conditions that are more difficult to treat and/or diagnose. Internists are also often trained to use advanced diagnostic and therapeutic procedures that may not be available at regular veterinarians. These include rhinoscopy, bronchoscopy, gastroduodenoscopy, colonoscopy, vaginoscopy, cystoscopy; thoracic and abdominal ultrasounds, computed tomography (CT or CAT) scans, stent placement and management including tracheal stents, urethral and uretheral stents, cystoscopic-guided removal of bladder stones, respiratory testing, blood and infectious disease workups, feeding tube placement, obtaining biopsies and cytology samples of many tissues, joint taps, bone marrow aspiration and core biopsy, CSF taps, and many more advanced laboratory testing.

The Role of an Internal Medicine Specialist

Your pet's condition may be more complicated than your regular veterinarian feels comfortable diagnosing and treating. Furthermore, your pet may have multiple underlying conditions that have conflicting treatments. This kind of patient will benefit from a consultation with an internist.

From animals that don't seem to be able to stop having accidents in the house to animals with severe heart disease that are oxygen dependent, and internist has the experience and knowledge necessary to deliver the absolute best care available. Some of the advanced diagnostics available can change a situation from one where we don't know what is causing a dog to stop eating and act tired to having the information we need to begin immediate treatment for a speedy and full recovery.

An internist is NOT a replacement for your regular veterinarian, but a power complement that works closely with your pet's family doctor to ensure that they receive the absolute best medical care that is available today.

VCA Highlands Ranch Animal Specialty & Emergency Center's department of internal medicine is lead by Dr. Steffen Sum. His focus includes extensive work and ongoing training in urology, diagnostic services, hemodialysis, infectious disease, advanced imaging and endoscopy.

Our Internal Medicine Services

Abdominocentesis
Bronchoalveolar Lavage BAL
Bronchoscopy
Colonoscopy

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