Meat isnt treated with anything other than chilling or freezing when you get it fresh from the butchers , you should be fine with it fresh , the carcas it came off may have already been frozen at some point , make sure they are knuckle end bones ask the buthcher to saw it smaller if too big then you could put the other bit in the freezer , dont be worried if it gets dirty a dogs stomach can cope with the bacteria .

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