In order to give you answers to your questions, we will need to know what
type of tumor it was.  Did the vet send the tumor out to a pathologist to
make a diagnosis?  Once we know what type of cancer it is, we can give a
better prediction of what to expect in the future.
 
Some ferrets will be become hypoglycemic after removing part of the liver,
so I would check his glucose level and add dextrose to his fluids/food if
needed.
 
Hope that helps,
Jerry Murray, DVM
[Posted in FML issue 3408]