Endovascular occlusion for the correction of an extrahepatic portosystemic shunt using a covered stent in a dog

A 25‐month‐old, 6.35 kg, entire, female Japanese Spitz was admitted to the hospital for evaluation of a 6‐month history of transient mental status alteration (obnubilation), seizures and poor body condition score. A solitary shunting blood vessel was identified on computed tomography. The dog was diagnosed with a portocaval congenital extrahepatic portosystemic shunt. Before surgical intervention, the patient was stabilised with medical treatment for 3 weeks. The patient underwent percutaneous endovascular shunting vessel embolisation with a covered stent. The increase in portal pressure after temporary occlusion was within the acceptable range, and complete occlusion was achieved in a single session. There were no complications, and the patient was discharged within 24 hours. Based on a literature search, this is the first report describing covered stent treatment for a congenital extrahepatic portosystemic shunt in a dog.