Here's a website that compares dry dog foods. It lists the top three ingredients, preservatives, fat, protein and kcal/lb(???).
http://www.frii.com/~phouka/dogs/dog_food.html

I don't know how accurate this is. If it is, Eukanuba, Science Diet and Iams all have corn as one of the top three ingredients.

[This message has been edited by Stenograsaurus (edited June 26, 2001).]