Not to defend Petco, but they just happened to make the hit list and get it announced publicly. I've been in plenty of warehouses for human as well as pet food and have seen plenty of little critters running around; don't be fooled into thinking that it's much different in every other warehouse / DC. Distribution Centers are tough buildings to keep pests out of. I've been in the Petco's Mira Loma, CA warehouse and it was clean as can be.

Things also change store to store. I've seen terrible Petco's and awesome Petcos, just like good and bad Petsmarts, Feed Stores, Targets, Wal-Marts... For every good there is bound to be a bad.