10-year-old male castrated Shetland Sheepdog with erosive to ulcerative and crusting lesions on the ventral abdomen, periocular and perioral skin.
Clinical history: The patient was presented for a second opinion following three months of progressive pyoderma and has been treated with cephalexin, prednisone, and oclacitinib. A partial response was achieved initially, but upon discontinuation of medications lesions rapidly progressed. The patient was also being treated with L-thyroxine by the referring veterinarian (dose unknown). Punch biopsies were obtained from the ventral abdomen.