Sick Sinus Syndrome in Dogs
Sick Sinus Syndrome is a high-severity cardiac condition that can affect dogs of all ages and breeds. Sick sinus syndrome is a dysfunction of the heart's natural pacemaker (sinoatrial node), causing an abnormally slow heart rate, pauses, or alternating bradycardia and tachycardia. It leads to syncope and exercise intolerance. It is documented across 4 breeds, though prevalence and severity can differ significantly between them. It typically becomes apparent at 6-12 years. Early signs to watch for include fainting episodes, weakness and lethargy, exercise intolerance, and slow or irregular heartbeat. When treatment is required, costs are estimated at £3,000-£6,000 depending on severity, location, and the specific intervention needed. Sick Sinus Syndrome 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 Sick Sinus Syndrome in dogs. If your dog displays several of these signs, consult your vet promptly — early diagnosis typically leads to better outcomes.
- Fainting episodes
- Weakness and lethargy
- Exercise intolerance
- Slow or irregular heartbeat
- Collapse
Treatment Overview
Medical management with antiarrhythmic drugs (atropine, theophylline) provides temporary relief. Permanent pacemaker implantation is the most effective treatment for persistent clinical signs.
Typical onset: 6-12 years
Prevention & Screening
While not all cases of Sick Sinus Syndrome can be prevented, the following steps reduce risk or enable earlier intervention:
- Do not breed affected dogs
- Annual cardiac Holter monitoring in at-risk breeds
Estimated Treatment Cost
Treatment for Sick Sinus Syndrome is estimated at £3,000-£6,000, 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 Sick Sinus Syndrome
The following 4 breeds are documented as being susceptible to Sick Sinus Syndrome. 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.