Here’s the More Dooks food chart for the tumblr ferret community. A helpful reference for those who don’t feed a raw/whole prey diet. This can also apply to cats too.
Green Tier : Highest Quality Kibble. Mostly based on raw meat that is not a byproduct. Actual organs. Little to no grain fillers.
Blue Tier : Good Quality Kibble. May use byproducts listed further in ingredients. Might have a few grain fillers.
Orange Tier : Average Kibble. More byproducts and more grain may be listed in the 1st ingredients.
Red Tier : Horrid Quality Kibble. Byproduct and grain based. Dubbed by many as “Insulinoma in a Bag”. Contains no good meat sources. Protein may be solely corn/soy based.