We switched Cujo and our other two guys from Totally Ferret to Science Diet c/d at the recommendation of the doctor who operated on Cujo. I agree that Totally Ferret is supposed to be the best, but when someone like Dr. Jeff makes a recommendation, I tend to listen. We also make a "slurry of c/d, boiled chicken, papaya tablets, and chicken or turkey baby food in the blender and give them some ever night, with a little whipping cream on the top. They dive into this like a teenager after a milkshake. They also get Nutri Stat and ferretone every night. Our son's ferret has been "visiting" our guys for a few days. He is usually very skinny, but even has picked up some weight. Ours switched from TF to the c/d without any problem. I have been told that the c/d denotes that is the Science Diet blend for urinary problems, which is what Cujo had. In no way do I put down Totally Ferret. I'm just following the advice of the vet who saved Cujo's life. Charlie, Ag, Donna, Cujo, Bandit and Snowball WE REMEMBER KODO [Posted in FML issue 2078]