Hi there,
We are complete novices as we have only had our cocker for 1 week, and he can't go out yet!
But have you tried the activity ball, where you can put treats inside? I have bought one today from the local pet shop for £6.99, put some puppy treats inside (which he can't get out unless you make the hole large enough) and it has kept our puppy occupied for hours!!! Might be worth a try.
Good luck
Jason, Alexis & Simba