Dry dog food (small biscuit shapes) (Forest Hill nr H'dington OX33)

Dog food originally from Tesco & used to feed black lab now sadly deceased. Gifted to us but not used as our dog is on a different make of food. Probably between 3-6 months of age. Stored in water/air tight plastic container until recently. Now in non original food sack. Should still be ok. About half a sack.