How do you get money cheat codes on Nintendogs?

Well you can't get codes, but I kow a PERFECT cheat!

If you go on a walk and you get a piggy bank or a vase, drop it on your floor in your nintendog's house, but before you do that cheat how much money you've got. Then drop it, look at the money now, you've more money!

Hope this works!

PS: it might not work i have Golden retriever on 3DS