A young diplomat falls in love with a lady he has followed in the street and in order to establish a relationship, he introduces her into her house proposing a connection between Titì, the lady's dog and her Pekingese. The husband of the woman, somewhat naive, lends itself to the game and the dongiovanni becomes a regular home. The lady knows how to resist the siege and, after the critical moment, speaks clearly to the young man who definitively desists from the enterprise.