Pseudallescheria boydii keratomycosis in a dog

A dog that had a chronic history of keratoconjunctivitis sicca and was being treated topically with antibiotics and corticosteroids was examined for evaluation of a melting corneal ulcer. Cytologic examination and cultures revealed the pathogen to be Pseudallescheria boydii, a saprophytic fungus. The eye was surgically removed and evaluated histologically. Fungal keratitis is rarely reported in dogs, but needs to be considered in refractory infections or in dogs treated with antibiotics or corticosteroids.