I've been having an interesting conversation with Johann's mum. She has two great video clips of how she trained Johann to succeed with the wooden Nina Ottosson Dog Casino.
First she taught him to focus on the little pegs that close off the drawers.
Then they moved on to pulling the pegs out of the holes.
So far we've practised Penny touching the peg for a reward from my hand. We moved on to clicking when she knocks the peg off the game, because I thought that might be closer to what we need finally, when she'll have to pull up the peg and throw it off the Casino so she can pull out the drawer to get the treats.
Johann's mum has mentioned the command 'pick it up' and Penny knows that well, so we experimented with that.
(I just can't seem to co-ordinate using the clicker and stopping myself from saying 'Yes!'. Luckily Penny's used to my muddled training methods, lol.)