Satchmo is off his food!

I'm now becoming worried about my little man.  He has turned his nose up at his food now for the second day in a row.  He will eat cheese if I hand feed him, but nothing else.  His bodily functions are all normal so I wonder if his mouth is hurting him.  He has begun to really paw at his muzzle again and loves for you to scratch the sides of his mouth.  I wonder if dogs can get dry sockets like people can?  If so, I am worried that he has developed this painful situation.  Today the vet will be closed and tomorrow I have to work so I will have to make do until I can get him in on Monday.  Anyway, I had saved two of his pain pills so I gave him one this morning.  Hope it helps.