many dogs when new at it will "stash" them...
im pretty sure they must taste even better with "dirt icing" lol.
i generally give mine thier raw bones in their crates, keeps them from wandering round and schmearing marrow all over the place, keeps them from getting into it with eachother and they realize its a safe spot and they can settle down and enjoy
raw bones are THE best thing you can do to your dogs teeth!