You would actually need to contact the food companies and ask how much liver is in the diet or ask for a nutrient analysis rather than just assume that a food is high in liver since USA dog food companies aren’t required to list ingredients by percentage. Take Primal Beef Formula raw food for example. It has liver as ingredient number 2, but their analysis shows vitamin A within guidelines at 11765 (minimum 5000, max 250,000).
http://www.primalpetfoods.com/product/detail/c/7/a/c/p/all/z/b/t/a/d/b/id/2
