Born in Paris, Dunouy studied under a history and landscape painter. He travelled to Italy, visiting Rome and Naples, where he resided until 1791. On his return to France that year, he exhibited his views of Italy at the Paris Salon. In 1810, he became court painter to Joachim Murat, whom Napoleon had made King of Naples. After the collapse of the French Empire in 1815, Dunouy worked around Paris, Savoy, the Auvergne and Lyon.