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Help! My Dog Is Fifteen Years Old, and His Yeast Infection Won't Go Away
Doris de Luna

You can understand the desperation of this dog owner, named Karin, who wrote to PetHelful for expert advice. After all, we love our dogs like family. We don't want them to suffer like this, and just because of yeast infection.
According to VCA Animal Hospitals, "Yeast dermatitis or Malassezia dermatitis is caused by the fungus Malassezia pachydermatis. It is an extremely common cause of skin disease in dogs. This yeast is normally found on the skin, but its abnormal overgrowth can cause dermatitis, or inflammation of the skin."

In his reply to Karin, Dr. Mark dos Anjos discussed an at-home treatment for yeast infection in dogs. It's a natural treatment that consists of "a medicated shampoo in order to remove the excessive crust, vinegar to acidify the skin, and coconut oil to improve the health of the bacterial layer on the surface of the skin."
When using this natural treatment, you need to know how to give a medicated bath to a dog.
The dog's diet also needs to change. Avoid starchy and sugary foods, which can worsen the infection. Probiotics, herbs, and lean meat protein are good choices.

But, based on Dr. dos Anjos's interpretation of Karin's message, she has already tried at-home treatments; that's why the wisest thing to do is to take her dog to a dermatologist for thorough skin examination.
Dr. dos Anjos also added, "If you do not have a dermatologist available to examine his skin condition, you can try taking him off any corticosteroids (both oral and topical, like the Zymox spray) and administering the yeast treatment in the article above for at least 3 weeks. If he does not respond, give a trial of ketoconazole for at least several months (and even up to a year if he is responding). Ketoconazole does have potential side effects, so I think it would be best to try the natural treatment first."
https://www.youtube.com/watch?v=HaFtCjseG_E