I wonder if it is even possible to test a dog food & tell the difference between poultry-by-product-meal and poultry-meal (I really doubt it). Blue Buffalo does contain poultry-meal & I'm pretty sure it would be picked up on any 'tests' Purina did as poultry-by-product-meal since they are basically the same thing with the pure poultry-meal being made without the inclusion of heads, feet & entrails (poultry-by-product-meal contains these). Nutritionally both meal & by-product-meal are nearly identical in nutritional content (via lab testing). [See here: www.hilarywatson.com/chicken.pdf‎] As for Purina's claim that Blue Buffalo contains corn, I call foul on this one! My dog is severely allergic to corn in any amount or form & would become severely ill, if not die, if he consumed even a small amount. He can eat Blue Buffalo with no problems at all, but not Purina. That, to me, means there is no corn in their pet food. Personally, I think that Purina is just upset that their sales haven't been as good since all those illnesses and deaths in pets from their 2 brands of jerky products over the past few years & they are trying to buy out or take down their competitors in order to get back their customer base.