Oliver, who will be 6 months on 12/9, has most recently been regressing in his potty training.  Twice in the past week, he has pooped and peed on the floor.  He usually alerts us by barking, running in circles, etc.  We even recently trained him to ring jingle bells on our front door which he only seems to do when frantic.  Up until this week, he has been very good and we have had few accidents, and if any, only pee.  Any insight or info would be appreciated.  We are frustrated corgi…