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Canine fungal skin infection is most often contracted by contact with fungal spores found in soil. Sometimes dogs get fungal infections from other animals or, more rarely, even from humans.
Types and Symptoms of Canine Fungal Skin InfectionDifferent types of canine fungal skin infection will have different symptoms.Ringworm (dermatophytosis) - the most common skin fungus. It looks like a red circle with pale centers. Despite the name, there are no worms involved; the disease gets its name from its appearance. It should be noted that people can catch ringworm from animals, so if your dog has ringworm, watch for symptoms on your own skin. 
Picture of Canine RingwormYeast infection (Malassezia) - another common infection. It causes red, scaly skin that may also appear greasy. It is often smelly as well. It is itchy and will cause your dog to scratch. Blastomycosis - less common. It is a systemic infection that causes respiratory problems, generalized weakness, a poor appetite, and even blindness. One of the first signs of the illness, however, may be round, oozing sores on the skin. The sores may crust over. Histoplasmosis - is another less common fungal infection. Like blastomycosis, it is a systemic infection and causes weight loss, cough, fever and diarrhea. It causes enlarged lymph nodes that may feel like lumps on the sides of your dog’s neck and in the “arm pits.” Sores may also appear on the skin. Diagnosis of Canine Fungal Skin InfectionDifferent types of fungal skin infection will also be diagnosed in different ways.Ringworm can usually be diagnosed just by looking at the skin. If needed, your vet can examine the skin under a special ultraviolet light called a woods light. Your vet may be able to diagnose a yeast infection just by looking at it. To be sure, your vet may rub a cotton swab on the infected area and examine it under a microscope. Blastomycosis can be diagnosed by examining secretions from the sores under a microscope. Histoplasmosis is diagnosed by blood tests. Treatment of Canine Fungal Skin InfectionFungal infections in dogs is usually treated with a combination of anti-fungal drugs, topical medications and anti-fungal medicated shampoos. Shaving your dog’s fur around the affected area may also help the healing process. If handling a dog with ringworm you must protect yourself with gloves when handling your dog, and wearing an apron or clothing that you wash subsequent to handling the pet. Ringworm on people can affect skin anywhere your body.Picture of Ringworm Spores
For ringworm you might want to try a natural remedy such as Dermisil for Ringworm.  which has a solid track record for treating the condition. You should also clean any rooms where your dog lives with a cleaner designed to remove fungal spores such as Benzarid  since spores can live for up to 18 months possibly reinfecting your pet. Ringworm usually requires a consultation with a veterinarian.Identifying the source of the infection is important so that you can protect your dog from becoming re-infected. Since the source is usually soil, think about where dog pet has been digging lately. Short of having the soil tested for fungal spores (an expensive and not widely available option for most people), the best you can do it provide a new area for digging or provide new activities to occupy your pet.
SourcesCarmichael, L.Recent Advances In Canine Infectious Diseases Scott, D. W., Miller, W. H., Griffin, C. E. PetEducation.com MerckVetManual.com From Canine Fungal Skin Infection to Dog Health Guide Home
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