@ossobuco,
Here's a closeup photo of Paolo Veronese's Christ in the House of Levi (it's at the Accademia Gallery in Venice):
and a photo of Velasquez's Las Meninas, at the Prado - with the dog quite prominent -
For something a little different, Pierre Bonnard's Nude in Bathtub (from the blog, the bark.com; Dogs in Impressionism, by James H. Rubin)