A friend sent us a couple toys and some purebites from amazon today... I didn't notice til I'd already given him a couple that they smell off... almost kind of rancid... I had some left from his last bag but opened this one cause that bag had gotten down to a lot of crumbs mixed in and I was going to save that to sprinkle on food when they get finicky... So I was able to compare the two... they're both chicken but the older bag smells more like chicken and the new bag smells...just off...less chickeny and more... maybe something close to rancid... the expiration date isn't til 2022 though. Can freezedried chicken even go bad?