If it were me I would GET MY DOGS OFF OF COSTCO DOG FOOD RIGHT AWAY!!!!!!!!!!!!! I have absolutely nothing against costco dog food and in fact, had both my beagles on the stuff till one passed away and the bags were simply too big for the 1 beagle that remains.
PLEASE READ THE FOLLOWING LINK AND ALSO DO YOUR OWN GOOGLE SEARCHING ABOUT RECENT DOG ILLNESSES WITH DOGS EATING COSTCO DOG FOOD.!!!!!
read several of the comments. There are a lot of bad experiences starting around the 1st of the year and dating backwards.
http://www.consumeraffairs.com/pets/..._pet_food.html