the dog immediately when it does things right.
when the dog has understood what to do you can hide a different number of treats each round, and it depends on the dog how many rounds you manage to do in a certain time.
if the dog tries to bite the game or the pieces, then put your hand over it and stop the game. when the dog has calmed down you can tell it to go ahead and let the dog try again. if the dog repeatedly wants to bite, then teach it to work only with its paws. if the dog rather wants to throw itself on the game and beat 