Laura Comstock's Bag-Punching Dog is a 1901 silent short film directed by Edwin S. Porter.
The film depicts a vaudeville act featuring Laura Comstock and her trained dog, a pit bull named Mannie.
Following this, the rest of the film shows Mannie in front of a rustic backdrop, repeatedly jumping and punching a bag suspended by a rope.
Edison's film catalog said that Mannie's "high jumps and lightning-like punches are remarkable and cause one to marvel at the amount of patience that must be necessary to teach a dog such tricks.
This was an innovation by Porter based on the practice of showing lantern-slide photos preceding the exhibition of filmed scenes.