It pays to comparison shop for pet food and other products. That's what our reporter found this past May when he went to Costco, Petco, PetSmart, Safeway, Target, and Walmart stores in the San Francisco area in search of 10 commonly purchased items.
In this informal market check, Walmart had the lowest prices in most cases, and Petco generally had the highest. Those findings are in line with a more comprehensive national comparison conducted by our sister publication, ShopSmart magazine, earlier this year.
We don't include Costco in the chart below because it didn't carry all the brands and package sizes on our list. But shopping there can often result in even bigger savings on a unit-price basis if you don't mind larger packages and a more limited selection.