My dog was eating salmon dog food from Costco. Comes in a blue bag. After about three or four bags of that salmon dog food, my dog started getting flaking of the skin on her back. Also some anxiety. I took her to the vet and had her tested. She had a bacterial skin infection. treated her with two courses of antibiotics. The infection cleared up a little i think, then came back. Took her back in and got the second round. Not much happened the second time. At the end of options with the vet, I gave my dog some French green clay. Eating clay is a long time tradition for absorbing toxins and metals, and can help stomach infections according to my very brief reading and knowledge on the subject. Anywho gave it to her for a few days. and quite for a week or two. repeated again. and repeated once more for a few days. Looks like her skin is still flaking a little bit after three brief rounds, but I think the french green clay may have helped something. I'm taking the clay too a bit. Think my gut function may be slightly better from it. I did add in something else at the same time, but feel I do benefit from ingesting the clay occasinally. My skin seems smoother and GI function seems better. It's important to find a clay that has been tested for bacteria and stuff, and do your own research of course to verify if it is something you are going to risk.