hahah larry, they are far more scared of a dissd witness than they are of huge dogs named satan, thats fer sure.
I know this sounds a bit mean but........
Another strategy would be to invite them in,but tell them that they have to sit
very still and not move a muscle while they do their talk,because the dog is very protective
towards his owner,and any movement of strangers will be seen as an attack.
Then watch them squirm in the very uncomfortable seats you have chosen out for them.
I wonder if they would come back for a second visit...