Pompeo Girolamo Batoni (Lucca 1708-1787 Rome)

A similar young pointer appears in Batoni's portrait of Frederick St. John, 2nd Viscount Bolingbroke of c. 1753 (E. Peters Bowron, Pompeo Batoni. A complete catalogue of his paintings, I, New Haven and London, 2016, no. 175, ill.)