[Susan]

The best thing you can do is report to FDA…
The packaging contains IMPORTANT information often needed to identify the variety of pet food, the manufacturing plant, and the production date.
https://www.fda.gov/AnimalVeterinary/SafetyHealth/ReportaProblem/ucm182403.htm

Then email the pet food company, then take back food for a refund & keep a few dry kibbles just in case you need for testing & do not buy that brand again…
Google, Heavy Metals Contamnates in dog foods, a site called CLP should come up, they do studies on 299 popular dog foods every 3 months….