see the comparison of the three products here:
http://naturapet.com/display.php?d=c...id4=&x=37&y=11
At first glance at the ingredients, my comments:
ProPlan has corn and poultry by-products and brewer's rice (a cheaper rice product)
Royal Canin has corn and brewers rice
Innova has neither corn or by-products and the first five ingredients are: Turkey, Chicken, Chicken Meal, Ground Barley, and Ground Brown Rice