4176 Meridian Street

Bellingham, WA 98226

(360) 758-2200

24/7 Emergency Care​

Board-Certified Cardiologist

Dr. Mark Harmon


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My Commitment To You

To our referring veterinarians, my commitment is to assist you in maintaining an excellent level of care for your clients and patients, to be your source for canine and feline cardiac care in Northwestern Washington, and to partner with you to provide this care.

To pet owners, my commitment is to ease the uncertainty that comes with a diagnosis of heart disease and give you the information needed to make the decision that is best for your specific animal family members. I am committed to be an advocate for your pets in their time of need.

– Dr. Mark Harmon
Primary Vets: Download Dr. Mark Harmon's FLyer


Dr. Mark Harmon is a board-certified veterinary cardiologist. Originally from Arkansas, Dr. Harmon has worked in primary care practice as well as specialty practice in both academia and private practice. He and his wife, Dr. Meghan Harmon, love the Pacific Northwest region and have moved from Seattle to British Columbia to join the incredible team at Boundary Bay.

Dr. Harmon has a special interest in congenital heart disease and interventional cardiac therapies such as pacemaker implantation, balloon valvuloplasty, and minimally invasive shunt occlusion. He has lectured locally and regionally on topics such as emergency management of cardiac disease, arrhythmia management, nutritionally-mediated heart disease, and heartworm disease. Dr. Harmon looks forward to being of service to dog breeders in BC and referring veterinarians throughout British Columbia (Vancouver, Victoria, Burnaby, Richmond, Abbotsford, Kelowna, etc).

Outside of work, Dr. Harmon is learning to snowboard and enjoys spending time outdoors with his wife and two dogs (a fox terrier mix and a Newfoundland), or just lounging at home with them. He also has a cat, although the cat may not claim him. He is also excited to become a Canucks fan!


Board Certification
  • Board Certification – American College of Veterinary Internal Medicine (Cardiology)
  • University of Arkansas, Fayetteville, AR – BS, Chemical Engineering
  • University of Missouri, Columbia, MO – Doctor of Veterinary Medicine
  • University of Pennsylvania, Philadelphia, PA – Internship in Small Animal Medicine & Surgery
  • University of Missouri, Columbia, MO – Specialty Internship in Cardiology
  • University of Missouri, Columbia, MO – Residency in Cardiology
  • Resident Teaching Award
  • Redhage Award, awarded for proficiency in canine medicine and strong client, patient, and veterinarian relationships
  • American College of Veterinary Internal Medicine
  • American Veterinary Medical Association
  • Canadian Veterinary Medical Association
  • College of Veterinarians of British Columbia
  • Veterinary Interventional Radiology & Interventional Endoscopy Society (VIRIES)
  • Jaffey JA, Harmon MW, Masseau I, Williams KJ, Reinero C. Presumptive Development of Fibrotic Lung Disease from Bordetella bronchiseptica and Post-Infectious Bronchiolitis Obliterans in a Dog. Frontiers in Veterinary Science, 2019; 6:352. doi: 10.3389/fvets.2019.00352
  • Deitschel S, Harmon MW, Odunayo A, Chang CH, Honker AR, DeClue AE. Supraphysiologic Parenteral Ascorbic Acid Blunts the Inflammatory Mediator Response to Pathogen Associated Molecular Patterns in Dogs Ex Vivo. Research in Veterinary Science, 2019; 124:228-232.
  • Harmon MW. Ruminant and Camelid Cardiology. In: Durham HE, editor. Cardiology for Veterinary Technicians and Nurses. Wiley-Blackwell, 2017. p. 443-457.
  • Harmon MW, Leach SB, Lamb KE. Dilated Cardiomyopathy in Standard Schnauzers: Retrospective Study of 15 cases. Journal of the American Animal Hospital Association, 2017; 53:38-44.
  • Fine DM, Selting K, Backus R, Rossi NF, Harmon MW, Durham HE, Spier A. Hemodynamic and Biochemical Alterations in Canine Lymphoma Following Induction of Chemotherapy. Journal of Veterinary Internal Medicine 2014; 28:887-893.
  • Harmon MW, Fine DM. ECG of the Month: Atrial Tachycardia. Journal of the American Veterinary Medical Association 2012; 240:668-670.
  • Harmon MW, Axiak SM, Yu DH, Chang CH, Fowler B, DeClue AE. Effect of Opioids on CXCL-8 Production in Healthy Cats. Research in Veterinary Science 2012; 93:1255-1257.
  • DeClue AE, Sharp CR, Harmon MW. Plasma Inflammatory Mediator Concentrations at ICU Admission in Dogs with Naturally Developing Sepsis. Journal of Veterinary Internal Medicine 2012; 26:624-630.
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