That's awful. I recently got some dog cookies that made Zayla sick. I put her on a bland diet for a couple of days of boiled chicken and rice. That always seems to do the trick then I slowely add kibble to it. The cookies were'nt old though I just think they had too many herbie things in it for their breath. Sometimes I think these company's do overkill on the dog items, trying to make them appeal to the people moreso than the dogs. But I would never think to check the expiration date on food.