North Seattle, WA (206) 364-1660

13240 Aurora Ave N

Seattle, WA 98133

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Mark Harmon, DVM, DACVIM-Cardiology


Specialist, Board Certified in Veterinary Cardiology

On The Job

Dr. Mark Harmon found that in veterinary school he gravitated toward cardiology because his undergraduate studies in chemical engineering gave him a unique appreciation for cardiovascular physiology. He enjoys all aspects of cardiology, but especially cardiac imaging, heart failure treatment, cardiomyopathies, pulmonary hypertension, congenital cardiac diseases and interventional therapies, to include pacemakers, balloon valvuloplasty and minimally invasive shunt occlusion.


Diplomate, American College of Veterinary Internal Medicine – Cardiology
Residency, Comparative Cardiology, University of Missouri, Columbia
Internship, Cardiology, University of Missouri, Columbia
Internship, Small Animal Medicine & Surgery, University of Pennsylvania, Philadelphia
Doctor of Veterinary Medicine, University of Missouri, Columbia
Bachelor of Science, Chemical Engineering, Fayetteville AR

Off Duty

Dr. Harmon enjoys hiking, watching Seattle sports teams and cooking with his wife, who also is a veterinarian. They have a Newfoundland who has lived a happy and healthy life after receiving treatment for multiple heart defects.

Select Articles and Publications

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.