As Nancy pointed outin her post to the following: >By the way, the doctor had us switch all three of our ferrets from Totally >Ferret to Science Diet C/D. We have also switched from tap water to >distilled water for them. I am not sure why your vet would have switched your ferrets from a proven food formula to CD-- CD is a corn protein base -- something ferrets cannot digest optimally -- if this was related to a UTI problem I would suggest getting Totally Ferret Senior diet. We are having WONDERFUL results from it with our oldster. The youngsters as well on Totally Ferret. DISTILLED water-- is not a helpful water resource unless you are compounding meds. They are always thirsty as there are no MINERALS in distilled water--- perhaps spring water would be a better way to go??? Fondly in ferrets, Alicia a shelter mom