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 suite, dental suite, 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.
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.
Thomas Mackowiak – DVM
As a charter member of the new breed of veterinarians, Dr. Mackowiak brings something to the table that few vets can match. From his attention to detail to his thoughts behind an individualized approach to pet care, he has started changing the standard of care by opening Heartfelt Veterinary Hospital.
A true man of the world, Dr. Mackowiak is at home in multiple languages, multiple cultures, and multiple disciplines. Having grown up in Germany, Thomas studied law in Chile, switched careers mid-stream, emigrated to Oregon to work on a veterinary research project, completed his studies at Oregon State University.
Thomas’ familiarity with so many varied cultures has given him an uncommon level of “emotional intelligence”, which allows him to see and sense things most other veterinarians miss. Combined with his professional expertise, Dr. Mackowiak combines these intangible skills to bring a multiplier effect to veterinary medicine, leading to a wonderfully constructive relationship between the Heartfelt team, your pet — and you.
A 2010 graduate of the College of Veterinary Medicine, Oregon State University, Dr. Mackowiak maintains veterinary licenses in Washington and California as well as Oregon.
Rebecca Sullivan – DVM/Associate Veterinarian
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.
Chelsea Larson, DVM
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Dr. Chelsea Larson completed both her Bachelor of Arts from Pepperdine University and Master of Science in Biomedical Sciences from Colorado State University. She then completed her Doctor of Veterinary Medicine Degree from Washington State University. Go Cougs! Dr. Larson enjoys interacting with clients and their pets, with specific interests in internal medicine, preventative medicine, and the human-animal bond. Though Dr. Larson is a Colorado native and still visits frequently, she decided to practice in the Pacific Northwest after meeting her husband (also a veterinarian) during veterinary school.
When not practicing veterinary medicine, her interests include baking, hiking, camping, and visiting the coast. She can also be found spending time with her two Shiba Inus, Kenji and Sushi. Dr. Larson is excited to meet you and your pets!