A couple weeks ago, I posted about getting the wieners a couple of Kong Wobblers.  At that time, despite my showing them what to do to get the kibble/treats out, they would not do it themselves.  They would watch me intently batting away at the Kongs like a trained monkey, knocking the kibble out.  Between bites, they would look at me to knock out some more.  They seemed to understand the concept that the Wobblers needed to be knocked around for the goodies to come out, they just wanted me to be the one to do it.