Study details rare hypotrichosis in deer and raccoons

A new brief report in the Journal of Veterinary Diagnostic Investigation describes noninflammatory hypotrichosis, an uncommon hair-growth disorder, in wild white-tailed deer and raccoons from the eastern United States. The authors documented seven total cases: six consistent with follicular dysplasia in two wild adult male raccoons and four wild yearling or adult white-tailed deer, plus one case of ectodermal dysplasia in a captive-reared stillborn male white-tailed deer. Across cases, animals showed regional or generalized hair loss, often with hyperpigmented skin, but the report emphasizes that these lesions were noninflammatory, helping distinguish them from more familiar causes of alopecia in wildlife such as mange, lice, or infectious dermatitis. The paper was first published online June 1, 2026, and adds to a small but growing literature on hair-coat disorders in cervids. (journals.sagepub.com)

Why it matters: For veterinary diagnosticians, wildlife veterinarians, and rehabilitation teams, the report is a reminder that not every bald deer or raccoon has an infectious or parasitic skin disease. State wildlife agencies note that deer hair loss is more commonly tied to seasonal molt, lice, mange, or dermatophilosis, and those conditions can carry animal health, handling, or public-facing implications. Recognizing congenital or dysplastic hypotrichosis broadens the differential list, may prevent overcalling transmissible disease, and underscores the value of histopathology when gross appearance alone suggests mange or another contagious process. (www11.maine.gov)

What to watch: Watch for follow-up case reports, especially any genetic work or surveillance that clarifies how often hypotrichosis is being mistaken for more routine wildlife skin disease. (journals.sagepub.com)