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Welcome to Justanswer. I am Dr. Loretta, a licensed veterinarian, and would like to assist you. I will respond quickly after reviewing your question.
Good Afternoon and welcome! I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
I am sorry that your guy still has this nose problem....because he is a bit older, there are a few other conditions that could cause this. The most likely is that your guy is suffering from an autoimmune disease called Lupus that will cause this scabby nose problem that is non responsive to other medications. The only way to know for sure is to have your vet biopsy your guys nose and run blood work...this will tell you exactly what is causing this and how best to treat this.
This LINK will explain in more detail.Does that make sense to you?
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That is great that no immune mediated problem seen on lab work but the biopsy and cultures will help. Lupus is not contagious and specific to the dog that is affected. Please let me know what the results are if you have time...Thanks!!
Not to worry. This is called Discoid Lupus and is limited to the nose. It is treated with steroids that will resolve this. It is not painful or fatal. There are other forms of Lupus that can be very serious but this is not one of them. This LINK will explain in more detail.