I have fed my ferrets 8 in 1 Plus Ultimate for about 7 years - It is 38% protein - I mix it with IAMS Adult Maturity Cat that is 32% protein - they have all done very well with this mix. I have never had a ferret that would eat Totally Ferret or any of the other brands - they totatlly would not eat! Plus you must always have a food they will eat easily available - and IAMS is (when I can't get 8-1 fast enough). My very first ferret came to me adopted and he only ate 9-Lives dry cat food all his life - he would NOT eat any ferret food - and believe me I tried them all! FerretVite is the greatest thing since sliced bread! My ferrets love it and I can clip toenails and everything with just a smudge! (All by myself which is important since I can't always expect a family member available to help cut all these fuzzy toenails!) This is just my experience and all fuzzies are not the same - you just have to try everything! Linda Z. with Nipper, Buckie, Jo-Jo, Tippi & Skippi Remembering: Clyde- who led me to the world of ferrets, Tiny, Angel, Spice & Sapp - my main man. [Posted in FML issue 4426]