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Hello, I am Dr. RB.. Has your DVM completed blood work to rule out endocrine disease? Many endocrine diseases in dogs can cause patchy alopecia including hypothyroidism and hyperadrenocortism.. Skin infection is usually associated with moist or ulcerative skin lesions, not just the alopecia alone. Another potential cause could be Demodectic mange.. Do you remember if your vet completed a deep skin scrape or skin cytology test?
I will do all I can to answer questions for you about Harbor's skin. Let me know if you have other questions or need clarification on my above response?