I have a young rescue working lad, who's a pretty good counter surfer too

Luckily he loves his ball & when he's picked up something unwanted on walks, I only have to say 'what's this ?' (in a silly voice

)& he either drops the item or brings it to me, then drops it when he sees his ball.
At home we practice swapping for something he can have but being young, this is still a great game to play it seems