The Old Maid's Baby(1914)

Bunny is rejected by Flora when her dog destroys his hat and gloves and she goes on a trip. She secretly takes the dog, dressed as a baby, on a train. An altercation occurs when another passenger, John, discovers the "baby" is a dog, which leads to the dog being accidentally dropped from the train. John retrieves the dog, winning Flora's gratitude, and proposes. This time, he is accepted.