Glad you solved it and in my house we discuss poop and vomit and whatever any animal is doing at the time and it is always at dinner.........Megan said:KK eats Orijen kibble & some milk bones only.
You know, right after I posted this I think I solved the puzzle.
He hasn't always had the problem.
You may be grossed out by the explanation.....
KK has had a slight eye infection with discharge, I've been keeping my own eye on it and this morning no discharge and tonight...no smell.
I think the eye drained more than I realized down into his face (probably while sleeping all night) rather than just the crusty stuff I removed each morning from the eye corner.
Sorry for grossing everyone out...for some of you it may be time for dinner...Enjoy!