Effectiveness of Microneedling Using Long Needles for the Treatment of Non-inflammatory Alopecia in Dogs

Non-inflammatory alopecia includes endocrine diseases and alopecia X. Microneedling (MN) promotes hair regrowth in cases with alopecia X. However, its effects on other non-inflammatory alopecia types remain unclear. This case report evaluated the effectiveness of MN in the treatment of alopecia in dogs with endocrine disorders. The study included one dog each with hypothyroidism (Case-1), hyperadrenocorticism (Case-2), and alopecia X (Case-3). Despite controlled hormone levels, dogs of Cases 1 and 2 showed no hair regrowth. Microneedling was performed on alopecic lesions, and hair regrowth was monitored at 1, 3, 6, and 12 months. In Case-1, almost complete hair regrowth was observed at 12 months. In Case-2, most lesions exhibited regrowth at 6 months, with no hair loss up to 12 months. Case-3 exhibited 51–75% regrowth at 12 months. These findings suggest that MN may serve as an adjunct treatment for dogs with controlled hormone levels but persistent alopecia.