Erik, In re-reading your post, you mentioned using Iams CAT Food - I HOPE you are really using Iams KITTEN food - if not, switch immediately to a kitten formula - it has a higher protein and higher fat content - all essential to a happy and healthy ferret. I do not recommend using an adult formula of anything until around 3 years of age. Debbie Riccio WNYFLFA Rochester, NY [Posted in FML issue 1184]