"I have 2 ferrets. One is 17 months old, the other is 5 months old. I've never had ferrets before and was told to feed them cat food. The baby, grew in length, but was not filling out. I switched to totally ferret, and in 2 weeks, he was a totally different ferret. He has grown huge, probably 3 and a half pounds now. The female has gained weight too. Their fur is beautiful, soft and they don't have as strong an odor to them any longer either. I highly recommend this food for all ferret owners. Oh and less cleanup also. My male, the baby is now a big muscular boy, and the female, who is deaf, has grown more also, although the male is double her size, she's the boss."