Dogs and ringworm: what people should know

Ringworm is a fungal infection, not a worm. In a dog, it may cause circular areas of hair loss, broken hairs, scaling, crusting, or itch, although some animals show subtle signs. In people, contact can lead to an itchy, expanding rash or scaly patch. The appearance can overlap with other skin problems, so a test may be needed.

Arrange veterinary care and avoid sharing brushes, bedding, towels, or close face-to-face contact until guidance is provided. Wash hands after handling the dog, wear disposable gloves for cleaning lesions, and launder washable bedding. Vacuum areas where hair and skin flakes collect, then follow veterinary instructions for environmental cleaning. People with a new rash should contact a healthcare professional and mention the animal exposure.

Seek veterinary care promptly for spreading hair loss, crusted lesions, multiple affected animals, or a dog that lives with children, older adults, or someone with reduced immune protection. A person should seek medical advice for a rapidly spreading rash, scalp involvement, broken skin, or symptoms that do not settle.

Ask the veterinarian how ringworm will be confirmed, whether topical or oral treatment is needed, how long isolation precautions should continue, and which cleaning steps are suitable for your home.