Don't you wish you could smell and tell Mags?? That's what I do with milk, esp since I drink organic and it's so expensive!!!! I've heard dog food sometimes expires before the "best by" date so I don't think I would use it girly. I would also check the ingredients of the product but I know you feed raw so I doubt the treat is full of grains which would not go bad as soon as meats/fruits/veggies etc.
Just my opinion...they put an expiration date on it for a reason right

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Hugs-
Viv