The dog see's a reflection of him with the bone and thinks it is another dog with another bone.
The Dog and the Bone is one of Aesop's fables
John Napier invented the Napier's Bone
How was the BONE NEEDLE invented?
A patient dog eat the fattest bone
Given the Dog a Bone was created in 1980.
A dog fetching a bone is a fine example of a treat. (for the dog)
The "dog and bone" is rhyming slang for "phone". Practical application: "Will ya shuddup, I'm on the dog and bone."
Clavicle bone
A dog fetching a bone is a fine example of a treat. (for the dog)
It means your happy just like a 'dog with a bone' to chew on.
Dog Mud Bone