A naturally occurring case of Tyzzer's disease due to infection with B
acillus piliformis in a wolf-dog hybrid resulted in widely disseminate
d lesions, including severe myocarditis, hepatitis, enterocolitis, int
estinal leiomyositis, and adrenal cortical adenitis. Previously report
ed lesions for canine Tyzzer's disease have been limited to hepatic ne
crosis and a necrotizing enterocolitis.