A five-month-old male pitbull dog was referred to the Small Animal Clinic, College of Veterinary Medicine, Universidad Autonoma de Nuevo Leon, presenting with numerous skin ulcerative lesions in the sternal and axillary regions as well as the hindquarters, with an evolution of two weeks. The objective of this study was to describe the morphological features observed in the skin of a dog infected with acid-fast bacilli and dermatophytes. Microscopically, the dermis showed numerous acid-fast bacilli, both within phagocytic cells and free in the tissue. Grocott?s dye revealed numerous bifurcated and septate hyphae with chlamydospores in the dermis along with evidence of the inflammatory reaction. Based on the observed morphological characteristics of the microorganisms, the diagnosis was ulcerative dermatitis caused by a simultaneous infection with Mycobacterium sp. and Trichophyton sp. In conclusion, this is believed to be the first report of its kind in a dog in Mexico.
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