I was told to buy cat food with NO red dye. 2 eight year old males...they adore Meow Mix but it's full of red dye. Does Purina have dye?
Purina makes a zillion different feeds. Here's what I feed my cats. They're all over two years old. I tried to feed the young and old cats separately, but they worked around my efforts.
http://www.purinaone.com/products_cat_seniorprotect.asp