Does your dog have a rash on their face or tail? Do they lick or scratch the area incessantly? Depending on their symptoms, it is possible they may be suffering from a ringworm infection.
This post will look at what ringworm is, signs and symptoms of a ringworm infection, how it is transmitted, diagnosis, and treatment options.
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Disclaimer: This post is meant to be informative and should not be taken as medical advice. Talk to your veterinarian regarding any health concerns you may have for your dog.
What Is Ringworm?
Ringworm, also known as dermatophytosis, is a fungal infection of the skin and hair.
Contrary to its name, ringworm is not a worm at all. The “ring” in ringworm refers to a circular pattern that a ringworm infection makes on those infected.
Infection is usually caused by one of three types of fungus:
- Microsporum canis.
- Microsporum gypseum.
- Trichophyton mentagrophytes.
How Is Ringworm Transmitted?
Ringworm is highly contagious and can be passed on through direct contact with another animal that has the infection or from objects contaminated with the fungus. This can include:
- Bedding.
- Brushes/Combs.
- Food/Water bowls.
- Blankets.
- Rugs.
Spores can also be found in soil, so a dog that likes to dig, particularly in an area where other animals like to frequent, can be more likely to be exposed.
Ringworm is also more likely to be found in warm environments and can last in the environment for 18 months.
Can Humans Catch Ringworm From Dogs?
Yes. It is possible for humans to catch ringworm from dogs. As mentioned above, ringworm is highly contagious and it can be passed to you from your dog.
This can be from touching your dog, or even touching their belongings. It is best to use gloves when touching your dog or their belongings if they are infected.
Is My Dog Likely To Develop Ringworm?
Ringworm is more likely to develop in a dog with a poor immune system. This can include:
- Puppies.
- Dogs with a medical condition that compromises their immune system.
- Pregnant dogs.
It can also be more prevalent in dogs that live in groups, or in a high stress situation, like in a shelter.
How Can I Tell If My Dog Has Ringworm?
There are several signs and symptoms that your dog may exhibit if they have a ringworm infection. These can include:
- Hair loss.
- Dry, crusty skin.
- Redness.
- Scaling of the skin. (This is the loss of the outer layer of skin that comes off in large flakes).
- Bumps on the skin.
- Increased pigmentation.
- Itchiness.
Where Does Ringworm Appear On Dogs?
Ringworm is more likely to develop on the:
- Face.
- Ears.
- Tail.
- Feet.
What Does Ringworm Look Like When It Starts?
If your dog develops ringworm, they may have loss of hair in a circular pattern.
The middle of the circle may also develop a lesion that can become crusty, and later, inflamed and scabby.
How Is Ringworm Diagnosed?
Ringworm is diagnosed by your veterinarian. There are 4 methods to diagnose ringworm: Wood’s Lamp, Biopsy of the Infected Area, Examination of Hair, and a Fungal Culture.
Wood’s Lamp
Wood’s Lamp is an ultraviolet light that when passed over infected areas, will cause the infected hairs to glow green. This allows for specific hairs to be plucked and tested for infection confirmation.
Biopsy Of Infected Area
A biopsy includes a scraping of the infected area to be examined under a microscope for positive diagnosis.
Examination Of Hair
A scope can be used to find broken hairs that may be infected. These hairs are then examined under a microscope.
Fungal Culture
This is used to examine lesions on your dog to determine which fungus has caused the infection.
How Long Does Ringworm Last In Dogs?
Most ringworm infections in healthy dogs are able to resolve on their own, but this can take a few weeks.
Treatment can be done to shorten the duration or for dogs with compromised immune systems.
How Do You Treat Ringworm In Dogs?
Your veterinarian will determine the best course of treatment for your dog based on their symptoms and overall health. Treatment options can include:
Oral Antifungal Drugs
Antifungal drugs can be given to your dog to help fight off the invading fungus. These can include such medications as:
- Itraconazole.
- Ketoconazole.
- Terbinafine.
These may be some side effects to these drugs, such as upset stomach, so be sure to discuss this with your veterinarian.
Topical Therapy
Topical therapy involves lime sulfur dip or bathing your dog at least twice a week with an antifungal shampoo. Look for a shampoo that contains at least 2% chlorhexidine and 2% miconazole. If you use a lime sulfur dip, keep in mind it will have a strong sulfur smell and your dog may need to wear a cone to avoid licking. Examples of each are included below. Product information is according to the manufacturer.
Shampoo
PetMd Microseb-CX Anti-Fungal Medicated Shampoo
- Contains 2% Miconazole Nitrate and 2% Chlorhexidine.
- Safe on dogs and puppies.
- Contains antimicrobial, antifungal, and antibacterial ingredients.
- Has aloe and antioxidants to soothe skin and coat.
- Fragrance free.
- pH balanced.
Check Price At: Chewy
MiconaHex + Triz Shampoo
- Contains 2% Miconazole Nitrate and 2% Chlorhexidine.
- Fragrance free.
- Treats fungal and bacterial infections.
- Contains ceramides to restore dry skin.
- Made in the USA.
Davis MicoHexidine Shampoo
- Has 2% Miconazole Nitrate and 2% Chlorhexidine.
- Antifungal and antibacterial.
- Fragrance free.
- pH balanced.
Nootie Medicated Pet Shampoo
- Contains 2% Miconazole Nitrate and 2% Chlorhexidine.
- Lilly Passion fragrance.
- Paraben free.
- SLS free.
- No harsh chemicals or dyes.
- Made in the USA.
Check Price At: Amazon
lime sulfur dip
PetMd Lime Sulfur Dip
- Contains a sulfurated lime solution.
- Designed to heal skin irritation.
- Antifungal, antimicrobial, and anti-parasitic.
- Needs to be diluted.
- Apply at 5-7 day intervals.
- Made in the USA.
Check Price At: Chewy
Vet Basics Lime Sulfur Dip
- Contains a sulfurated lime solution.
- Antimicrobial and antiparasitic.
- Needs to be diluted.
- Apply at 5-7 day intervals.
- Made in the USA.
Environmental Cleaning
Since ringworm can live on surfaces for up to 18 months, it is important to do a deep cleaning of your home surfaces. This includes: rugs, couches, dog beds, dog bowls, sheets, blankets, and any area where your dog likes to frequent.
Even if your dog is on medication and getting baths, it is important not to skip this step, as your dog can be re-infected if this cleaning is not done.
Is It Ok To Bathe A Dog With Ringworm?
It is ok to bathe a dog with ringworm, as noted above, however, it should be fine with an antifungal shampoo and not a regular shampoo, as this will not help the infection.
Unfortunately, ringworm is contagious and causes our dogs to lose hair. Fortunately, it can clear up on its own in time. Lime sulfur dips and antifungal shampoos are available to use to help our dogs heal faster. Speak to your veterinarian if you suspect your dog has ringworm and to develop a treatment plan that works for you and your dog.
Please check out our other posts on Health, Indoor, Outdoor, and Travel accessories for your dog, as well as Reviews of various products and travel destinations.