Self-Cured Flank Alopecia in a Dog

A 2-year and 8-month-old castrated male Jack Russell terrier presented with flank alopecia that self-cured without treatment. The alopecia, characterized by hair thinning and pigmented macules, showed no signs of itching or systemic symptoms. Histopathological examination revealed slight hyperkeratosis and pigmentation, but no significant inflammation or infection. Despite using a moisturizing shampoo, hair regrowth began 4 months after initial examination and was complete by November, with no recurrence by September 2011. The case resembled seasonal or recurrent flank alopecia but differed in timing and pigmentation, suggesting an idiopathic cause.