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Ringworm In Cats and Dogs

What is Ringworm?

Ringworm is not actually caused by a worm, but rather by a fungus that 
infects the outer layer of skin and hair. It is a zoonotic disease, meaning it 
can be transmitted from pets to humans, or people to pets.  There are 
numerous species of ringworm. It is most commonly recognized in cats 
(often kittens) and dogs, although rabbits and rodents can also become 
infected. Ringworm can be very contagious.

Can I Get Ringworm from My Pet?

Yes. Anyone that has come into contact with the infected animal or its 
environment has the chance of contracting ringworm. In people, the infection 
may appear on the skin as a ring with reddish borders and is usually itchy. 
If you have any concerns about ringworm in family members, please seek 
advice from your physician.

How is Ringworm Treated?

Ringworm is easily treatable in humans with only topical medication. 
However, this is not the case with pets. In order to eliminate ringworm 
from animals, topical and oral anti-fungal medications are required, and 
it often takes months for complete resolution.  Oral medication is either 
itraconazole or fluconazole.  Topical medications are daily miconazole or 
clotrimazole creams plus weekly lime sulfur dips.  Once the skin starts to 
improve, a fungal culture  will be obtained and sent out to monitor the status. 
As soon as there is one negative culture, a second culture will be sent to the 
lab.  Dermatologists recommend that treatment be continued for one month 
beyond the second negative culture.  It is important that your pet receive their 
medication and treatment regularly.

How Do I Clean My House?

Ringworm spores can survive in the environment for two years. Pets and 
people can become re-infected if the house isn’t properly cleaned.

The best product to kill ringworm is bleach (1:10 dilution with hot water). 
You can also use Lysol with Bleach or 409. Make sure to use any product 
liberally and repeat cleaning daily.

Vacuum carpets, floors, and furniture frequently and dispose of the vacuum 
bag immediately.

All curtains, comforters, etc. should be dry cleaned at a professional cleaner.

Clean all air vents and change filters often. 

It is also recommended that items that cannot be bleached (e.g. floor rug, 
couch, etc.) be placed outside in the sun on a hot day.

Wash all sheets, blankets, towels, pet beds, plush toys, pet brushes, etc., 
bleaching items when possible.

Throw away anything that cannot be fully cleaned.

Be sure to talk to your veterinarian if you notice any changes in your pet's 
behavior or if your pet does not appear to be improving. 

Sources: University of Guelph, Worms and Germs Blog
WebMD, Ringworm of the Skin



Does My Pet Have Ringworm?

In animals, ringworm usually appears as a crusty or scaly patch on the skin 
with some hair loss. The affected areas may become red or irritated looking. 
Ringworm is sometimes itchy.

Occasionally, ringworm will fluoresce under a black light.

Unfortunately, a cat can have ringworm and not show any skin lesions at all.

A fungal culture is the best test to diagnose ringworm; it typically takes one to 
three weeks to get results. Fungal cultures will also be used to monitor the 
progress of treatment.

Call your veterinarian if you notice any hair loss or excessive itching in your dog 
or cat.

Veterinary Topics