FieldDxDermatophytosis in Dogs and CatsClinical signs, differential diagnosis, treatment and prevention in dogs and cats.
Overview
A contagious fungal skin infection, and a recognized zoonosis. Dermatophyte fungi, most commonly Microsporum canis. Zoonotic: this condition can pass to people.
Clinical signs
- Hair loss, scaling, crusting erythema, papules, hyperpigmentation, variable pruritus.
- Nodular kerion reactions can develop in dogs.
Predisposing factors
- Young, immunocompromised, or long-haired animals more susceptible; contact with contaminated environment or fomites.
Look-alikes to rule out
Treatment
Combined topical (to disinfect the coat) and systemic antifungal therapy; resolution typically takes 6-12 weeks.
Prevention
Isolate and treat affected animals promptly; decontaminate the environment to limit spore spread.
Source
MSD Veterinary Manual — Dermatophytosis in Dogs and Cats (accessed 2026-08-11)
A Textbook of the Diseases of Cattle, Horses, Sheep, Pigs and Goat by ELSEVIER — Ringworm
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