Leonardo da Vinci (Italian, 1452-1519). Studies of a Dog's Paw, ca. 1485. Metalpoint on pale pink prepared paper. 14.1 x 10.7 cm (5 1/2 x 4 3/16 in.) Purchased by the Private Treaty Sale with the aid of The Art Fund 1991 (D 5189).© The National Gallery of Scotland, Edinburgh. Photo Antonia Reeve, Edinburgh.