Baby Doug and Puppy Sophie humor

Adorable Curiosity: Baby Doug's Dental Inspection of Puppy Sophie in the Latest Dog Eat Doug Comic Strip!

In the first panel of this Dog eat Doug comic strip, baby Doug looks inside puppy Sophie's wide open mouth.
In the second panel of this Dog eat Doug comic strip, baby Doug continues examining inside puppy Sophie's mouth.
In the third panel of today's Dog eat Doug comic strip, baby Doug shrugs and says, "Bak." Puppy Sophie asks, "Nothing?"
In the last panel of today's Dog eat Doug comic strip, Sophie and Doug walk away. Sophie says, "Phew. It was only a dream that I ate Dad's recliner."

Who needs a vet?