Are you still using piggybank for your rest coins? That’s really old way. Check out Mog Mog Wanco, a piggybank not piggy, which is designed by Bandai.
As same as normal dog, Mog Mog Wanco has a delicate sense of smell, but not for everything, just coins. When you hand a coin over, the doggie is able to identify it, and moves its mouse to beg you for the coin. If you want to get the coins swallowed out by him, just push the doggie’s tail
Mog Mog Wanco doggie bank is available in three colors, pink, white and black. Each of them costs about $24 USD. You can grab one at Amiami.