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  Do I understand correctly, your little guy is a year and a half, and you just recently got him, and he had the problem when you got him?
 Did you get him from a breeder or a pet store?
 
 When they get a skin infection they do smell bad.  there are two forms of mange, one is treatable, the other is very difficult to treat.  I would ask the vet for more information.  did they do a skin scraping to determine what he has?
 
 If you have a veterinary university colse to you, you might want to try contacting them.
 
 My concern with one so small would be what harm all those chemicals are doing to him.
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