Yesterday, I purchased a bag of ferret food, as it seemed better suited to ferrets than the cat food we usually use. I don't think it's very popular, as it smells very differently, and at least Carmen spends a lot of energy trying to dig out some real cat food out of the food bowl, so it creates a bit of a mess on the floor.
I don't think it smells good either, but at least it smells more like meat and blood than the cat food.