Abstract
A 14-year-old female dog of Ainu breed was admitted to a veterinary hospital. It showed signs of congestive heart failure with accompanying chronic interstitial nephritis. In the pathological examination, a focal microinfarct was present in the myocardium and it was surrounded by an area of fibrosis in the left ventricular wall. Before death, there were no findings clearly suggesting the presence of this type of lesion obtained by electrocardiographic examination and serum analysis, but marked increase in CPK-MB/ total CPK activity was observed.
