That's easy. Isn't that pretty much the defining characteristic of all the paper you now define as the only money?
The original dogs were gold and/or silver coin, an undeniable historical fact that will never go away. Paper IOU instruments were created by a transaction using this money, which instruments were measured in terms of money, and are what you now indeed call...money!
The paper currency, once issued by banks and now widely referred to as "money", were the original barks,
not dogs, created far in excess of the hard specie they [mis]represented. Somehow these instruments, these barks, which were created by a transaction using money, and were measured in terms of money, were magically elevated to the status of real dogs, not barks, once the gold and silver origins were removed.
Woof!
Ironically, right now we have an echo of that original scenario, wherein substitute instruments
of paper instruments that were once substitutes themselves are created. The paper instruments (original barks which you now refer to as dogs), are now being used to create yet other instruments (mere echoes of the same bark). These instruments, which are measured in terms of the paper instruments, are but nothing but echoes of barks (which echoes you don't want counted as a dogs)! Now that's rich.
Now that Sweden is going paperless, and Canada is looking to follow suit, you may have to evolve your thinking, and adapt your paradigm, as what you consider barks, not dogs, may be the only things circulating if the paper itself is removed, as gold and silver once were, after which even the concept of "reserves" becomes a virtual abstract - a controlling number and a fiction in itself. No actual money. Just a number, as whatever-it-is-that-circulates-electronically out in the real world is the only thing that is counted by anyone as money. And I've no doubt that a future Black Flag will defend these transactions as such, crying out, as you now do against gold and silver coin, "Paper and coins are not money! Can you use them to buy food? No. Can you pay your taxes with them? No." lol