"__ the Dog"; Hoffman/De Niro film

I believe the answer is:

wag

(Other definitions for wag that I've seen before include "Brisk rear movement or funny fellow" , "Joker; move tail" , "Move from side to side like dog's tail" , "Move briskly like dog's tail" , "He must be joking" .)

I've seen this clue in The Mirror.

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