Domenico was born in Venice, studied under his father, and by the age of 13 was the elder Tiepolo's chief assistant. By the age of 20, he was producing his own work for commissioners. He assisted his father in Würzburg, decorating the famous stairwell fresco, in Vicenza at the Villa Valmarana in 1757, and in Madrid at the palace of Charles III.
His painting style developed after the death of his father in 1770, at which time he returned to Venice, and worked there as well as in Genoa and Padua. His painting, though keeping the decorative influence of his father, moved from its spatial fancy and began to take a more realistic direction. His portraits and scenes of life in Venice are characterized by movement, colour, and deliberate composition.
Many of Domenico's works are drawings, and as his father, he was a fine draftsman and a competent etcher.He produced 104 sketches of Punchinello, the standard character of the commedia dell'arte, a physically deformed clown. These were created as Entertainments for the Children, and attempted to poke fun at the pretensions and behaviour of the viewer.