This study was performed to examine the clinical, serological, ultrasonographic and pathological findings in dogs with acute liver disease induced by tetrachlorethylene at 4 times of anthelminthic oral dose. The results obtained through this experiment could be summarized as follows: 1. The dogs administered with tetrachlorethylene, revealed decreased body weight, and showed lethargy and depression. 2. In serological findings, bilirubin values slightly increased, AST and ALT was decreased at 1∼3 days, and after that time increased according to the lapse of days, and revealed the highest at 5 days, and decreased to normal values at 6 days. 3. In ultrasonographic findings, branches of the portal vein were increased, the echodensity of the liver parenchyma was decreased at early stage, and increased at mid stage, and decreased at last stage. 4. In histopathological findings, necrosis of parenchymal cell, and perivascular hemorrhage were observed more severely at 6 days, as compared with 3 days. There results suggest that ultrasonographic examination is considered to be a more simple, rapid, non-invasive and useful diagnostic method for acute liver parenchymal lesion.