I agree we need to be concerned about this. My dog gets only fresh wild caught salmon fillets; the same that I eat, and canned that is also wild caught. Another thing with the manufactured foods is that they add leftover garbage and try to pass it off as lovely salmon fillet, chicken breast, etc.. It can be costly, but I have lost 2 beloved German Shepherds to cancer, and I’m doing everything I can to prevent it happening again with my new pup. I have only one dog at a time, so that helps with the cost.
