Every now and again, your beloved pet ferret will get sick. It may be something simple such as a flu or something more complex such as insulinoma. The best thing that you can do is to be aware of changes in your pet's behaviour and what such changes could mean. Here is a
link to the Ferret Association of Connecticut's SYMPTOM CHART for ferrets. This is by no means a comprehensive list of symptoms and illnesses, but it is a pretty decent little guide.