Newfoundland & Heart Disease

Dilated Cardiomyopathy (DCM)Subaortic Stenosis (SAS)

Newfoundlands face two major cardiac concerns: DCM (acquired, typically developing in adult dogs) and subaortic stenosis (SAS, a congenital defect present from birth). SAS causes narrowing below the aortic valve, forcing the heart to work harder to pump blood. Mild cases may never cause problems, while severe cases can cause exercise intolerance, fainting, or sudden death. DCM in Newfoundlands follows a pattern similar to other giant breeds.

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Heart conditions in Newfoundlands

Dilated Cardiomyopathy (DCM)

High risk

DCM is a significant concern in Newfoundlands, with familial patterns well documented.

Subaortic Stenosis (SAS)

Moderate risk

Newfoundlands are predisposed to subaortic stenosis, a congenital narrowing below the aortic valve.

Screening recommendations

Start screening at

1–2 years old (for SAS), 3–4 years old (for DCM)

Frequency

Annually (echocardiogram)

Recommended tests

Echocardiogram, Doppler flow assessment

Genetic factors

Both conditions have hereditary components. SAS inheritance is complex and not fully understood. The Newfoundland Club encourages cardiac screening of all breeding dogs. Responsible breeders have breeding dogs screened by a cardiologist and cleared through OFA.

Common medications

Pimobendan (Vetmedin)Atenolol (for SAS)Furosemide Benazepril

Medications are determined by your veterinarian based on your dog's individual condition. This list represents commonly used medications for this breed's typical cardiac conditions.

Prognosis

For SAS: depends on severity — mild cases often live normal lives, severe cases carry risk of sudden death. For DCM: similar to other giant breeds, 1–2+ years with early detection and treatment.

Other breeds at risk

Doberman Pinscher

Boxer

Great Dane

Irish Wolfhound

Disclaimer:This content is for educational purposes only. It is based on published veterinary research and community experience, but is not written by a veterinarian and does not constitute medical advice. Every dog is different. Always consult your veterinarian or a board-certified veterinary cardiologist before making any changes to your dog's care, diet, or treatment plan.