Over Christmas in the evening we would have a bit of Christmas cake and Barley and Berry would have a treat. When the cake was gone we started on the chocolate and Barley and Berry would have a treat. Now all the chocolate has gone,at the same time Barley and Berry still knows that they have a treat. Barley is the one who asked for one and Berry followed. They won't settle until they had one. Can understand why the breed is chosen for assistance dogs.