This is inherent in a real dog.

I remember one of my favorite school novels, where two wanderers meet in the forest...at night they are building a fire and frying their bacon, when one of them's dog appears with a captured rabbit. The other wanderer says: if we take the truth, the dog will only get the bones. To which the dog's owner says: if we take the truth, the dog will get the whole rabbit, because he caught it