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]