I have been putting all my change including loonies and toonies into my piggy bank and haven't had a problem. What I did, though, is I went to Dollarama and bought (in the toy section) 2 plastic piggy banks with no hole in the bottom (this was the key for us to make it work). I use one for all my Canadian change (and my dad throws $20's in there whenever he comes over), and one for my American change. We even put American pennies in there and it does add up.
My suggestion is to get a piggy bank or something else that your DH can't get in to. My DH used to fish coffee money out all the time, but not since we got this pig.
Good Luck