Ringworm (dermatophytosis)
Ringworm (dermatophytosis) is an infection of the skin, hair or claws caused by fungi called dermatophytes. It affects many domestic animals such as cats, dogs, rabbits and guinea pigs, and can also be transmitted to humans. It is generally...
What is it?
Ringworm (dermatophytosis) is an infection of the skin, hair or claws caused by fungi called dermatophytes. It affects many domestic animals such as cats, dogs, rabbits and guinea pigs, and can also be transmitted to humans. It is generally not serious but remains very contagious.
Commonly observed signs
These signs are neither exhaustive nor specific. Only a veterinarian can establish a diagnosis.
Related signs — each one links to its page:
There are circular areas of hair loss, often with scales or crusts, sometimes with slight redness. Itching is variable and may be absent. In some animals, only a few broken hairs are visible without obvious damage.
When to consult without delay
This list does not replace veterinary advice. It gathers situations that justify a prompt consultation.
Causes and risk factors
The disease is caused by dermatophyte fungi, mainly Microsporum canis in cats and dogs. These fungi feed on the keratin found in skin, hair and claws.
Young animals, elderly or immunocompromised individuals, and those living in communities (breeders, shelters) are more exposed. A long coat, insufficient hygiene or a humid environment also favor infection.
Transmission
Transmission occurs by direct contact with an infected animal or by contact with contaminated objects such as litter, brushes or laundry. Fungal spores can survive for a long time in the environment, promoting spread.
Diagnosis and care
Diagnosis is the veterinarian's responsibility, based on clinical examination and laboratory tests. Care is decided case by case.
When faced with suspicious skin lesions, it is important to consult a veterinarian for advice and appropriate treatment. Do not attempt any treatment without professional advice, especially given the risk of transmission to humans.
Prevention
It is advisable to isolate any suspicious animal, regularly clean its environment and wash shared equipment. Washing your hands after contact with an affected animal also helps limit the spread to humans.
References
ESCCAP — European Scientific Counsel Companion Animal Parasites
Content reviewed by the TunisieVet editorial team · Updated 18 August 2026
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