Why do dogs bury bones?

Dog

When a dog buries a bone, it is probably following an age-old habit of burying food for safekeeping. The ancestors of dogs were wild animals that lived outside. These animals had to hunt for their food.

They often buried the food they couldn’t finish eating in a meal, hiding it from scavengers.  This also enabled the wild dogs to have a leftovers for a future meal.  Modern house dogs are still born with this instinct to bury food, even though it is no longer necessary.  

When burying a bone, a dog digs the hole with its front feet, but covers the bone with its nose.–Dick Rogers