One of Charlie's most lovable qualities is his ability to interact with everything from inanimate objects to animals to people in such a uniquely charming way. He showcases that ability (the middle part mostly) in A Dog's Life when the Tramp acquires a new canine pal that brings his life into perspective, and even helps him land a girl and a peaceful and fulfilling life.
A Dog's Lie is an extremely cute and amusing short with Charlie in his best comedy shape. His chemistry with the dog is adorable and the story is fun and entertaining. It's not really a hilarious film, but it has so many brilliant moments that gives you a glimpse into Chaplin's genius as a physical comedian. There's one scene where he has a conversation with a man only using his hand. Only Charles Chaplin could pull that off. And he does. Brilliantly so. There are lots of other great and brilliant funny moments, and the entire experience is good fun and simply happy-tear-jerking . And of course, another heart-melting ending, just as everything you'd expect from the master of heart-melting endings.
Oh, and on a side note, this is first film where Charlie appears with his brother Sydney, and the chemistry between the two is magical.