So "finish" is like "break", letting him know you are satisfied with the number of repeats or duration? I have used a similar cue, kind of a "no reward marker", which is "try again". We have a trick where we play fetch with two identical balls and a basket. Brody must drop his ball into the empty basket before I throw the other ball. Sometimes he gets going so fast that he just tosses the ball and turns to chase the next one, not realizing that he missed the basket. If he doesn't realize it right away, I say "try again" and he has to look for the ball and place it in the basket. So far I have only really used it for this game, but today I started using it with his "lift" cue as he would occasionally only barely lift his foot, but I was looking for a higher or longer lift.