This is a Carte de Visite (CDV), which is French for "visiting card." These small photo cards were commonly traded and collected by people in the 19th century; most popular in the 1860s. Standard-size card, measuring about 2.5 x 4 inches. Image comes from the painting "A Jack in Office" by Edwin Henry Landseer. The title is a slang expression for a pompous government official. It is a pun on the principal character: a Jack Russell terrier. A critic described how 'the well-fed and much caressed dog…keeps others from testing the food of which he has had too much'.