License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Stefano della Bella. Child teaching a dog to sit, the child seated to left against a wall, teaching the dog to sit on its hind legs, another child embracing a dog to right in the background, ca. 1660–64. The Metropolitan Museum of Art.