Ringworm in Cats and Dogs: Symptoms and Treatment

Ringworm, or dermatophytosis, is one of the most common skin diseases in pets, caused mainly by Microsporum canis, M. gypseum, and Trichophyton mentagrophytes. It matters for public health because most strains are zoonotic, survive for three to four years in dry conditions, and resist ordinary disinfectants. Infection spreads by contact or contaminated objects, peaking in warm, humid weather. Signs are round patches of hair loss, redness, and scaling, usually without itch. Treatment uses topical and, for widespread cases, oral antifungals, plus environmental cleaning. This guide covers the cause, signs, and care.