Lymphoma or Lymphosarcoma is the most common type of cancer in ferrets. Often, there are very few early symptoms of this disease. Some possible symptoms could be weakness, diarrhea, weight loss and swollen lymph nodes. Your ferret may also experience difficulty breathing or develop a cough.
A complete blood work up and examination by your veterinarian is really the only definitive way to properly diagnose this disease. It usually strikes ferrets who are four years of age or older, however there is also a form of this cancer that strikes young ferrets as well.
For more information on ferret health conditions, training and how to teach your ferret some Fun Tricks, purchase The EverythingFerret Complete Guide to Ferrets and Ferret Care.