Skin problems in dogs are not uncommon—but if bald, scaly patches suddenly appear, a fungal skin infection may be the cause. This fungal infection is not only uncomfortable for your dog, but can also be contagious to other animals and even humans. In this article, you’ll learn how to recognize and treat fungal skin infections in dogs and how to prevent future infections.

What is a fungal skin infection in dogs?

Skin fungus, also known as dermatophytosis, is usually caused by so-called dermatophytes (filamentous fungi) such as Microsporum canis, Trichophyton mentagrophytes or Microsporum gypseum . These fungi affect the skin, hair, and sometimes the claws. Young dogs, animals with weakened immune systems, or dogs from shelters or breeding facilities where there is close contact with other animals are particularly susceptible.

Fungal spores are very resilient and can survive in the environment for weeks or even months—which sometimes makes treatment challenging.

How can I tell if my dog has a fungal skin infection?

The symptoms of a fungal skin infection can vary from dog to dog, but typical signs include:

• Circular, bald patches in the coat

• Scaly, red, or crusty skin

• Itching – sometimes severe, sometimes barely noticeable

• Brittle or discolored claws

• Skin changes on the face, paws, or belly

The infection often starts in a small area and spreads further if left untreated. What makes this particularly dangerous is that a fungal skin infection can easily be mistaken for other skin conditions, such as mites, hot spots, or allergies.

Is a fungal skin infection contagious?

Yes—and that’s an important point! Skin fungus is zoonotic, which means it can be transmitted to humans. Children, the elderly, and people with weakened immune systems are particularly susceptible. Other pets can also become infected. That is why it is important to act quickly if you suspect a fungal skin infection and to take appropriate hygiene measures.

How is a fungal skin infection diagnosed in dogs?

Only a veterinarian can definitively determine whether your dog has a fungal skin infection. There are various diagnostic methods available for this:

• Wood's lamp: Some types of mushrooms fluoresce under UV light—but not all of them.

• Microscopic examination: A skin scraping or plucked hairs are examined.

• Fungal culture in the laboratory: Here, the pathogen is precisely identified—but this usually takes 1–2 weeks.

An accurate diagnosis is important so that treatment can be targeted and no valuable time is wasted.

How is fungal skin infection treated in dogs?

Treating fungal skin infections requires patience, as these infections are persistent. Depending on the extent of the infection, the following measures are used:

• Topical treatment: Antifungal ointments, creams, or medicated shampoos are applied directly to the affected areas.

• Systemic treatment: In cases of severe or widespread infection, the veterinarian prescribes antifungal tablets.

• Cleaning the Environment: Blankets, baskets, rugs, toys—everything must be cleaned thoroughly and regularly to prevent reinfection. Special disinfectants can help kill the spores.

• Caring for the skin barrier: Healthy skin regenerates more quickly and provides less of a target for pathogens.

Tip: Skincare products with natural antibodies, such as the Doderm Repair Gel, can gently support the skin barrier without disrupting the skin’s delicate microflora. Especially after a fungal infection has subsided, such care helps to soothe the skin and strengthen it over the long term.

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How long does it take to heal?

The duration of treatment depends on the severity of the condition—you should generally expect it to take 4 to 8 weeks. It’s important to complete the full course of treatment, even if your symptoms have already disappeared. Otherwise, there’s a risk that the fungus will return.

Can you prevent skin fungus in dogs?

You can't completely prevent fungal skin infections—but there are things you can do to lower your risk:

• Boosting the immune system through a balanced diet and low stress levels

• Regular grooming and checking for skin changes

• A clean environment, especially if there are multiple pets in the household

• Gentle skincare productsthat don’t dry out or irritate the skin

• Be careful when coming into contact with infected animals (e.g., at dog training schools or animal shelters)

Conclusion

Skin fungus is unpleasant, but it’s easily treatable—if caught early. Keep an eye out for changes in your dog’s coat or skin, and consult your veterinarian if you suspect an infection. With consistent treatment, plenty of patience, and the right care, your four-legged friend will soon be back to running around happily and stress-free.

Especially after recovering from an infection, the skin needs time to regenerate. This is exactly where the Doderm Repair Gel can help your dog: It supports the skin’s natural healing process, soothes irritated areas, and restores the balance of the skin’s flora—all without harsh ingredients. Ideal for sensitive dog skin and daily care following a fungal infection.

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