Disappearing Treat Magic Trick Leaves Dogs Dumbfounded

We love watching our dog Cooper react to treat time.  That word, treat, does amazing things.  He'll sit, speak, shake or do just about anything else when there's something tasty waiting on the other end.  And who can resist that face (above)?  However, this magician makes treats disappear, and the dogs...let's just say they're left thoroughly confused.  The trickery begins :10 into the video below: