Hi.  I am obviously way behind on FMLs, but I wanted to comment on this:
 
>but my other 4 ferrets never had this problem.  the doctor now has dante
>on prescription diet cat food from the vet.  as well as my other ferrets
>now too.
 
Did your doctor tell you to give the prescription diet to the other
ferrets?  If you are feeding them CD/O or CD/S (I didn't catch if your
ferret had oxylate crystals or struvite crystals), a ferret that does NOT
have crystals in their urine can get the opposite problem from feeding
the prescription diet-that can be as fatal as the one with the problem
going untreated.  Please check with your vet if you are feeding everyone
the same prescription diet now.  FYI!
 
-April
 
"There's nary an animal alive that can outrun a greased Scotsman."
-Groundskeeper Willy, "The Simpsons"
[Posted in FML issue 4000]