Here is the link to the talk about it here:
http://www.yorkietalk.com/forums/yor...thoxyquin.html
And here is an interesting discussion about it on another forum:
Taste of the Wild Ethoxyquin Free? - Boxer Board
From what I gather, the company says they don't use it, but they don't guarantee that their suppliers do not.
Directly from the forum I listed above: "When it comes to fish products, in the US it is required by law that all ocean fish products destined for pet food meal be preserved with Ethoxyquin (yes, the law stipulates that chemical specifically). For anyone to NOT be using fish meal products preserved with ethoxyquin, then their suppliers must either be supplying non-ocean farmed fish or else they must have a special dispensation from the law (i.e. allowed to use some other preservative instead). As you might imagine, that would be a tiny minority. And if it were the case, you'd expect your dog food manufacturer to be shouting it from the rooftops as a marketing point."
And directly from the FAQ on Orijen's site:
ETHOXYQUIN: Does ORIJEN contain ethoxyquin?
A: No. ORIJEN fish meats arrive FRESH; which means they are never frozen and have no preservatives what-so-ever. We work directly with our fish meal suppliers and pay them a premium to have ORIJEN fish meals preserved naturally with Vitamin E, Citric acid and Rosemary extract instead of the commonly used ethoxyquin preservative.