They all claimed to use human grade meat and didn't seem to have filler. I will look for the chemicals you mentioned.
Onlynaturalpets--Is that a website or a brand?
Sitstay sells a lot of the same things, they are based in Nebraska... I think onlynatural has a larger selection of foods. We are lucky that we have a natural pet store in town now, but I order all my dog meat from a small, family farm in Pennsylvania and my greentripe from a farm in California.