yep, this. I got a bag of Orijen freeze dried raw for 4.00 because it was the sell-by/best by date. It was fine, I used it for a couple of weeks as treats. As long as the bag is sealed and it's not something particularly wet, I really wouldn't worry.I purposefully buy staledated treats on clearance.... it's a best before date, not an expiry date like would be on medications (where the product is reduced in efficacy or otherwise chemically altered from oxidation and the like after a period of time).
But I also eat condiments, etc. that are past their best before date.