Little Dog: If there's ever been a big bone sitting next to me, then this would be the biggest one!
Little Dog: (inside Big Dog's stomach) PINOCCHIOOOO!!!
This is actually a double reference: the act of shouting "Pinocchio" inside Big Dog's stomach is parodying the Monstro scene in the classic 1940 Disney movie Pinocchio, and the manner of referencing Pinocchio itself comes from an old Bugs Bunny cartoon entitled Acrobatty Bunny (1946), when Bugs shouts "PINOCCHIOOOO!" in an identical manner into a lion's huge mouth.