A. Has hormonal disease like hypothyroidism been ruled out? That is a hormonal disease that is common causes of symmetrical hair loss, and it can be genetic, so you would see it in a dog that's very young like yours. I agree that treating for mange was also a good idea, since that can cause hair loss as well and sometimes we can' actually find the mites on a skin scraping.
Was a biopsy performed on the testicle? Because intra-abdominal testicles frequently turn into Sertoli cell tumors, which also cause symmetrical hair loss. If a biopsy was performed you should know for sure whether that was the cause of the hair loss or not. If the testicle wasn't cancerous and removing it did not resolve the hair loss then the next step is a skin biopsy, unfortunately. Sounds frustrating - good luck.
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