Yes, only if it is small corn cob. Some dogs tend to chew on the cob and break it into tiny pieces. This may be easier to process than a large cob, so your dog is likely to expulse it the other way around within a few hours or days. Of course, this is not always the case. It may take over 72 hours of anxiety and discomfort for both you and your dog. But it may happen. Either way, don’t expect this to happen and call your vet first.