Hi there, when ferrets continue to lose weight I have often had success using cream to get them back on track. Though lactose in milk can upset a ferrets digestion it seems the lactose is in the watery aspect of milk, the thicker the cream the less the lactose. I use a 1ml syringe without the needle and dribble it into the side of the mouth, they soon get used to it and being high in fats etc it does help. Once used to it they will often lap it up from a bowl sitting on my lap. (I let it come close to room temperature before giving it to them.) Any sign of Dairrhea and I stop, give it a day or two and try again. Of course as always, advice of a vet to ensure it wont contra meds is advisable in each situation. Another product to try is the Ensure type of product often used for elderly people unable to eat standard foods, it is like a complete meal in a shake, here in New Zealand we can buy them quite cheaply from a chemist. They are full of nutrients etc and easy to give. Hope your fert gets well soon. Cheers Michelle and Da Clan [Posted in FML 7131]