Transcript:
Poncho: You're not fooling anybody posing as a normal human, mister mailman!
Mailman: What?
Poncho: Stay back! Or I'll turn on this vacuum cleaner!
Mailman: You silly dog. Humans aren't afraid of vacuum cleaners.
Mailman: OW!
Boomer: RUN!
Dogs don´t have opposable thumbs to grab stuff either :).