I recently cleaned out my desk and found some information that I had requested from the Hill's Science Diet Company. At the time, I was dealing with Ferris having irritable bowel syndrome (IBS) or food allergy or insulinoma (or whatever was his underlying illness since we never got a definitive diagnosis). Anyway, if you have ever looked at a can of A/D food, there is not really any nutritional information listed. I called the customer service line and the woman I spoke with was knowledgeable and helpful. She sent me printouts on both A/D and Z/D prescription diets. Florence Love and I just discussed this the other night and questioned why A/D would be "prescribed" by vets instead of Z/D for ferrets with IBS, possible food allergies or other digestive issues. A/D is supposed to be for short term use, while Z/D seems to be more of a long term food choice. If anyone knows about Z/D prescription diet or has used it, please share your thoughts. Also, Z/D comes in both canned form and kibble. Lesley [Posted in FML 6220]