
Can't remember if you have any experience of clicker or not but that would be something to make him think and use his brain.
With my Beardie/Borderx I taught him things like going after his ball at different speeds, sent him for his ball and stopped him or turned him away to right or left, different things round the house fetching papers, mail, washing, taking things to different people in the house.
Hope this gives you some ideas,
Anne