My brother gave Lady a bone and she started chewing on it. When I tried to touch it, she snapped at me. She put the bone in her kennel. She broke a piece off the bone and started walking around with it, whining because she couldn't fine a place to put it. Dogs are protective of their food, no matter who tries to take it from them.
Dogs also like to save food for later, and they try to hide it.
Sometimes they bury bones, sometimes they just try and hide them behind things. Later, when they are in the mood to chew again, they go find the hidden bone.