The truffles are underground and can't be seen, so how the heck do you find em? That me, was one of the key fascinations that led me to work on this book. The dog doesn't actually care about eating the truffle. It just wants to treat. So that will dig up the truffle for you and then look for its treat. No pigs have been used in a long time. But back in the 17 hundreds, people figured out that it was a lot easier to work with a dog than a pig.