Canine alopecia X-Like disorder

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Hospital (AUVTH) for a 6-month history of non-pruritic alopecia on the hips and back, with the skin turning black in those areas (Figures 1 and 2 ). The animal had a prior history of hypothyroidism (controlled at the time of evaluation) and a urinary tract infection. The dog was on levothyroxine, Interceptor plus, Nexgard, fish oil, and Royal Canin Veterinary Diet Adult Urinary SO Dry Dog Food. There was no travel history outside the Southern United States. This animal was cohoused with another healthy dog. Bloodwork was unremarkable and testing for Cushing's disease was negative. Skin scrapes, cytology, and dermatophyte and bacterial cultures were negative. Gross Findings: Three 3 x 8 mm punch biopsies from the dorsum are examined. Two of the samples are hyperpigmented and alopecic, from areas of hypotrichotic. One of the samples is from the shoulder region with mild hypotrichosis.