Our Practice

We are a full-service animal hospital providing comprehensive pet healthcare services in the heart of downtown Portland, OR. Our veterinarians offer a wide variety of medical, surgical, and dental services. Our hospital has advanced equipment and technologies, including comprehensive in-house testing for accurate diagnosis, digital x-ray, surgical suites, dental suites, and a pharmacy. We are committed to providing quality care at every stage of your pet's life. From routine preventive care to early detection and treatment of a wide range of conditions and diseases, we have the expertise to provide the highest standard of care for your pet. We also serve clients from Vancouver, WA, Milwaukie, Beaverton, Lake Oswego.

  • Stacey Martzall – DVM/Medical Director


    Dr. Stacey Martzall was born and raised in Longview, Washington. She attended the University of Portland for her undergraduate degree in Biology and attended the College of Veterinary Medicine at Washington State University. Dr. Martzall worked in Longview at several hospitals over the years. She also worked at the Humane Society for many years and developed a low-income spay/neuter clinic at that location. She came to Heartfelt Veterinary Hospital in March of 2019 and became the medical director in October. She also works several times a month for the Feral Cat Coalition in Portland as a high volume spay/neuter surgeon. Her special interests in veterinary medicine are geriatrics and internal medicine. Her favorite part of the job is interacting with people and helping them to understand and participate in the care of their animals. She is an avid fan of live theater, especially musicals. She loves to travel, especially to visit friends in Mexico. She also loves to cook, do embroidery and many other crafts, and also enjoys swimming and working out.

  • Rebecca Sullivan – DVM


    Dr. Rebecca Sullivan was born and raised in Portland, where she developed an early interest in the well-being of animals. Throughout her life, Dr. Sullivan has volunteered for a number of animal welfare organizations including the Oregon Humane Society, and she continues to volunteer for Portland Animal Welfare Team on her time off. Dr. Sullivan was inspired to pursue an education in veterinary medicine at Oregon State University after she adopted her dog Elephant, who was very ill with pneumonia at the time. Elephant made a full recovery and this friendly little pup now accompanies Dr. Sullivan all around the city and on all her outdoor adventures. Dr. Sullivan is certified in veterinary acupuncture and enjoys keeping up on current veterinary research in order to offer a multi-modal approach to canine and feline wellness. When not practicing veterinary medicine Dr. Sullivan enjoys rock climbing, backpacking, home improvement projects and gardening.

  • Clarissa Zuver – DVM


    Dr. Clarissa Zuver has been practicing veterinary medicine in the northwest for the past 15 years since she graduated from veterinary school at Oregon State University in 2006. She spent the last 7 years at a busy multi-doctor practice in Gresham prior to joining Heartfelt in December of 2020.

    Dr. Zuver enjoys everything that the pacific northwest has to offer including hiking, camping and horseback riding as well as taking advantage of the fine dining and various entertainment venues offered in Portland.