14 months are definitely a good prospect for maturing into a better walk-on. Darine on the other hand, she's got the looks of a powerful dog, but she is not very strong. Which is kind of funny because Bonnie always looked sweet and gentle, but as Derek says, the sheep are the ultimate judge of the dog, and it was Bonnie who had the power to move anything, not Darine, and it was Bonnie who knew how to deliver a stone cold, deliberate grip when needed, and it was very rarely needed. Darine is made nervous by pressure, but since this is stock work, it can be put to good use as seen in the vid. The interesting thing is that Bonnie was able to drive really mean ewes of a different breed than skudde, without any violence on either side them. Skudde in the video are very nice sheep, not aggressive. And when this lamb-infested bedlam needs to be moved a bit more efficiently, I take Bonnie ona leash and I hang back with Bonnie providing the power, and Darine the direction for the flock.
The funny thing is that just about everybody I've met got Bonnie and Darine completely wrong when it comes to power and inner calm. Darine likes to move slowly, but inside there is this tension. And that's why in a flock with lambs I do not insist on smarter pace, because it may and up with a 'pow!'