Subaortic Stenosis (SAS) in Dogs
Subaortic Stenosis (SAS) is a high-severity cardiac condition that can affect dogs of all ages and breeds. SAS is a narrowing just below the aortic valve that obstructs blood flow out of the left ventricle. This forces the heart to work harder, causing left ventricular hypertrophy and risk of sudden death in severe cases. It is documented across 6 breeds, though prevalence and severity can differ significantly between them. It typically becomes apparent at Birth-2 years. Early signs to watch for include exercise intolerance, syncope (fainting), heart murmur, and sudden death in severe cases. When treatment is required, costs are estimated at £1,000-£4,000/year depending on severity, location, and the specific intervention needed. Subaortic Stenosis (SAS) has a hereditary component, so health-screening certificates from the breeder are strongly recommended for predisposed breeds. This page covers symptoms, treatment options, and preventive steps — along with breed-specific information where available.
Signs & Symptoms
The following symptoms are commonly associated with Subaortic Stenosis (SAS) in dogs. If your dog displays several of these signs, consult your vet promptly — early diagnosis typically leads to better outcomes.
- Exercise intolerance
- Syncope (fainting)
- Heart murmur
- Sudden death in severe cases
- Weakness
Treatment Overview
Mild cases may not require treatment but need monitoring. Severe cases are managed with beta-blockers (atenolol) to reduce cardiac workload. Balloon dilation has limited long-term success.
Typical onset: Birth-2 years
Prevention & Screening
While not all cases of Subaortic Stenosis (SAS) can be prevented, the following steps reduce risk or enable earlier intervention:
- Cardiac clearance by cardiologist before breeding
- Avoid breeding affected dogs
- Annual echocardiographic assessment
Estimated Treatment Cost
Treatment for Subaortic Stenosis (SAS) is estimated at £1,000-£4,000/year, depending on severity, the specific intervention required, and your location. Costs may be higher for surgical procedures or ongoing management. Comprehensive pet insurance covering hereditary conditions is strongly recommended.
Breeds Affected by Subaortic Stenosis (SAS)
The following 7 breeds are documented as being susceptible to Subaortic Stenosis (SAS). Click any breed to view breed-specific information about this condition, including prevalence and recommended screening.
Looking for more information? Browse all dog health conditions or explore the health guides for in-depth breed care advice.