Sue,
Have you returned to your veterinarian for a recheck?  If a prescription
does not work, the vet may have an alternative, or can suggest further tests
to determine the problem.  A skin scraping could be helpful, as ferrets can
get scabies, and scabs on the feet are a sign of that infestation.  It could
also be a bacterial infection that is not responsive to that particular
medication.  Unfortunately, there are so many causes of skin problems that I
can't help you with treatment without further info.
 
Please visit your vet and let us know the outcome,
 
-Dr. Karen
 
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[Posted in FML issue 1536]