Besides coughing there are other signs your dog might have something in his throat. An owner will sometimes notice that their beloved companion is constantly smacking his lips and swallowing.
There is a possibility that something is stuck in the dogs throat.
The foreign object is probably not large enough to affect his breathing but its still very annoying and he keeps trying to swallow it.
If he has an obstruction in his mouth or throat check this out once again.
It is likely that the dog will try to bite you if he is in distress so be extremely cautious around his jaws.
Rather than treating the dog at home take it to the vet.
Endoscopy is often required to remove the foreign object when the dog is sedated by the veterinarian.