I have heard that lower protein and less fat is better for older ferrets. One of my females got a serious kidney infection months ago and I attributed this to a diet too high in protein. The diet I was feeding her changed the ingredients and I did not realize it at first. It went from I think 36% to 40%. Now I feed Eukanuba adult, Maxicat and Iams. All Cat foods. I wish there was some great ferret food, But all seem to have a lot of corn even the better brands. My babies have tried everything; Marshalls, 8&1, TF, Shepard & Green. All of them are over three, the ages are 5, 4, 3, 3. They run free so I have to have a food they can all eat. They do not like Shepard & Green for older ferrets? I also feed Eukanuba weight control formula to my 3 year old, almost 3lb female. She will only eat duck soup (her food soaked in water mixed with babyfood). Any suggestions. This food issue drives me nuts! I want what is best for them. They also tend to like a variety and two of them enjoy switching foods frequently, particularly after they have had an illness> Thanks, Kelly [Posted in FML issue 3349]