A user has sent in California Natural to Epertox, it came back clean. There is no acetaminophen in Natura products. Take your dogs in again - if there is nothing wrong with the bloodwork, then you are crowding the boards with nothing.
If you are really concerned about your pet food SEND IT IN YOURSELF TO GET TESTED. Geesh, people. Others are doing it. That's how this all got started. So send your samples in yourself (instead of guessing - which this is all it is, there is no proof WHATSOEVER in what you claim).
I am on disability, I work for no pet food company.