The portal vein on the dog's liver has one or more blood vessels connected to the hepatic vein, causing a large amount of substances in the blood to flow through the body without being metabolized and detoxified by the liver, causing obvious clinical symptoms. Portal vein short circuit can be divided into intrahepatic short circuit and extrahepatic short circuit according to the location, and is divided into simple short circuit and complex short circuit according to the size of the short circuit. Extrahepatic short circuits are common in small dogs, and intrahepatic short circuits can be seen in large dogs.

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Yorkshire, Maltese, Schnauzer, Pug, Golden Retriever, Labrador and other breeds are prone to portal vein short circuit. The clinical symptoms are diverse, causing vomiting and diarrhea, loss of appetite, drooling, convulsions, head against the wall, urinary stones, etc.