He had been himself all day and even while watching me make dinner. He was his normal excited self when David came home etc. So he had to have gotten that in his mouth while we were eating I think. At first I thought maybe he was just sleepy and wanted the quiet of his bed. Occasionally he goes and lays back there during the day but not usually in the evenings.

Silly boy. If he had done more to alert me rather than just moping in his bed I would have looked in his mouth sooner!