From the Blood Glucose level listed for the ferret in question, I would have to say insulinoma may NOT be the problem this time, if the test was accurate. That is the first assumption made when there is hind-leg weakness, but it has been my experience that anything that makes a ferret weak will cause hind-leg weakness. It seems that is the weak spot in a ferret. So any ferret that stops eating or gets weak for any other reason will usually get the hind-leg weakness. In our household, it always turned out to be Lymphoma. The only thing that can be assumed for certain when hind-leg weakness is present is that the ferret is weak for some reason, although I think some back injuries can also cause this symptom. I know this isn't really an answer, but the best answer will have to be derived from having your vet do a thorough physical on the ferret in question and continue to watch for any further symptoms. Best wishes that it won't be anything too serious! Holly Icarus & Cato [Posted in FML issue 5296]