ZOMG

The infection in his right nasal sinus is taking over his face.
And look at those eyes.
No wonder he's raving like a lunatic.
He's a sick, sick puppy.

Update:   The people who obsess on such things observed he wasn't sniffing as much this time.
So they went back and noticed it was because he was mouth breathing instead.
Uh huh.  Go figure.

That is not "one weird trick".  That's a symptom of respiratory distress...