Duck 4. Taste of the Wild specifically states on their site that they source all of their protein meals from vendors who do not use ethoxyquin as a preservative. I suppose it could come from the protein meals which can contain skin.

This is another ingredient with lots of protein. Not Specified

Lots of people who feed this food are unaware that it is made by Diamond and they might not feed it if they made the connection. Features see all.