Portosystemic Shunt in Dogs
Portosystemic Shunt is a high-severity gastrointestinal condition that can affect dogs of all ages and breeds. A portosystemic shunt (PSS) is an abnormal blood vessel that allows blood from the gastrointestinal tract to bypass the liver, preventing detoxification. Toxins accumulate in the bloodstream causing hepatic encephalopathy. Congenital shunts are hereditary. It is documented across 6 breeds, though prevalence and severity can differ significantly between them. It typically becomes apparent at Under 2 years (congenital). Early signs to watch for include stunted growth, neurological signs after eating (circling, head pressing), seizures, and excessive salivation. When treatment is required, costs are estimated at £3,000-£7,000 depending on severity, location, and the specific intervention needed. Portosystemic Shunt 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 Portosystemic Shunt in dogs. If your dog displays several of these signs, consult your vet promptly — early diagnosis typically leads to better outcomes.
- Stunted growth
- Neurological signs after eating (circling, head pressing)
- Seizures
- Excessive salivation
- Increased thirst and urination
- Urinary crystals
Treatment Overview
Surgical closure or attenuation of the shunt using an ameroid constrictor or cellophane band is the definitive treatment. Medical management with lactulose, antibiotics, and protein-modified diet is used pre-operatively and in non-surgical cases.
Typical onset: Under 2 years (congenital)
Prevention & Screening
While not all cases of Portosystemic Shunt can be prevented, the following steps reduce risk or enable earlier intervention:
- Do not breed from affected dogs or close relatives
- Genetic testing under investigation
Estimated Treatment Cost
Treatment for Portosystemic Shunt is estimated at £3,000-£7,000, 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 Portosystemic Shunt
The following 6 breeds are documented as being susceptible to Portosystemic Shunt. 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.