Back years ago when I was a den leader in Cub Scouts, some used to recommend taking dog bone treats in your backpack for emergency survival food. The thinking being, the scouts would probably eat anything remotely edible without saving it for emergency use. Dog bones are probably not considered "remotely edible" unless you're in the middle of an emergency (except to dogs, of course!) I never choked one down myself, but assume they wouldn't kill you if you ate one.