One Good Turn Deserves Another (1924)

This is the story of a homeless little dog that was being abused by a flock of cats. He manages to hide himself in an old barn and is befriended by a good-natured little mouse. By 'm' by this same series of devilish cats starts a lot of crooked business and try to involve this selfsame mouse. Things look dark for Mr. Mouse for a time, but our friend the dog comes dashing to the rescue and saves the day for his mouse friend. Proving that: "A grain of help is worth a bushel of pity."