I might give one of these a go with Stevie - the Sporn hasn't been as effective on her as it was with Jimmy. Whereas he's head down and full steam ahead, Stevie bounces about and darts from side to side. Easy to deal with when there's just her but not when I've got all 3 of them together. The stop/start method dosn't work with her ( she just seems to think I like stopping a lot), nor does the turning back the way we came ( 'wahey, we're going this way now ? Cool.'
).