Blastomycosis, a granulomatous type fungus infection, affects dogs, horses, and man with the majority of the cases being in dogs. This disease is caused by the fungus, Blastomyces dermatitidis. It is a chronic, insidious disease manifested in two forms, either cutaneous and/ or generalized systemic. Blastomycosis is fatal once the disease is disseminated. Cutaneous lesions may persist for months.