Observations of a Denning-Related Dermatitis in American Black Bears

We describe symptoms and prevalence of an undiagnosed dermatitis in American black bears (Ursus americanus), characterized by alopecia and edema of the head, neck, and thorax. The dermatitis was primarily associated with hibernation: observed during 23% of 358 den handlings (excluding cubs), but <1% of 521 active season captures. It appears common, but rarely life-threatening; etiology, distribution, and transmission are interesting topics for further study.