Hi Russell,
Take COSTCO’S Natures Domain back to store & get a refund, it has to be the food poor dog feed her a bland diet, lean white meat & some boiled sweet potato 3-4 small meals a day till she is better..if she doesnt get better take her to vet & keep receipt so you can ask Costco to refund the vet bill..
Before you return dog food write down-
Exact name of the product and product description
UPC code (also known as the bar code)
Net weight
Purchase date and exact location where purchased.
& keep about 1/2-1 a cup dry kibble in a sealed sandwich bag just in case its needed
then report to FDA
https://www.fda.gov/AnimalVeterinary/SafetyHealth/ReportaProblem/ucm182403.htm
