The results of a post-mortem examination of 15 dogs suffering from acute viral infection probably of parvoviral etiology, are described. The characteristical finding was an acute catarhally hemorrhagic or even a hemorrhagically necrotic enteritis, eventually a colitis with isolated intranuclear inclusions in the epithelium of the crypts, there was also a marked depletion of lymphocytes in the lymphatic organs and some atrophy of the bone marrow.