2 days ago, my 6 year old lab dog chewed a 4 inch corn on the cob. He behaved normal since then, but today since morning he seemed lethargic and not eating. After watching him for few hours, I took him to the emergency vet. They did xrays and found the thing in the large intestine and seem to be moving. He advised to watch him for some more time and if he doesn't eat, them bring him back again. Can I give him a Vaseline bread sandwich, can it help him pass the thing as it is in the large intestine?