Dog Skin Conditions: Ringworm

The cause, symptoms, and treatment of canine ringworm (dermatophytosis).

The cause, symptoms, and treatment of canine ringworm (dermatophytosis).

Cause: Fungal infection, most commonly Microsporum canis, but other species of Microsporum or Trychophyton fungi also cause ringworm. Dogs acquire ringworm when they come into contact with infective fungal spores in the soil or on other animals (including cats), bedding, brushes, and other objects.

Symptoms: Ringworm can affect the skin, hair, and nails. The classic lesion is a round hairless patch circled by a rim of inflammation, but some dogs have different symptoms, including itchiness and reddened, scaly skin with bumps or pimples.

Treatment: Most dogs can recover from ringworm on their own, but treatment will keep them from spreading the disease to other animals and people. Medicated dips, shampoos, and ointments are usually effective, but oral antifungal medication such as griseofulvin or ketoconazole may be needed for resistant cases.

Disclaimer:’s Dog Skin Conditions are intended for educational purposes only. They are not meant to replace the expertise and experience of a professional veterinarian. Do not use the information presented here to make decisions about your dog’s ailment. If you notice changes in your dog’s health or behavior, please take your pet to the nearest veterinarian or an emergency pet clinic as soon as possible.

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Dogs · Health and Care

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