mysterious spit bubbles

All Hail the Bubble King! Dog Eat Doug Crowns Doug the Ruler of Glistening Globules

Funny Free Comic Strips: Baby Doug sits n the floor making an "o" shape with his mouth.
Funny Free Comic Strips: A bubble emerges from Doug's mouth.
Funny Free Comic Strips: The bubble gets bigger.
Funny Free Comic Strips: The bubble pops.
Funny Free Comic Strips: Doug smiles with drool dripping down his chin. Sophie walks over and tells him spit bubbles are his super power.

Dog Eat Doug: From Drool to Dazzling in Today's Comic

Would never have thought I would write so many spit and drool gags until I had kids and dogs.