Not MY dog, though we did name him Cash (it was a play on his parents' names). In years past, however, if you were fond of the nifty mechanical banks that were prevalent, why, a dog could hold all kinds of lucre for you till later.
Like this fine 1887 bulldog from the Minneapolis Institute of Arts. He's made of iron, but stick a copper on his tongue and he'll hold it for you. Lots of good stuff at the MIA - I promise to show you a few more coming up.