> It might be that you have to walk them separately; I've spent years doing separate dog walks so that the younger ones get enough exercise but the old ones don't get taken too far or too fast - it's time-consuming but it's perfectly possible.
True. Even setting aside the fact that round here you're only allowed 4 dogs per person out on walks - I couldn't manage my 6 together anyway. So I have to do separate walks. Even if I just had 4 I would have to - Soli can't take much pavement walking on account of her terrible joints, and off-lead wise she's a pain in the backside for annoying River.
It is doable - in particular I find it much easier to pair Soli up with either Remy or Opi (as they are both calm outside, and she just badgers River constantly) for any lead-walking, then I have more control over her and she is calmer in herself. Also the 300 peck method (one step with nice walking = treat; then two steps with nice walking = treat; then 3, on up to 300 - and going back to 1 if she pulls or mucks about) can be amazingly effective - I've done it a few times with Soli and although we've not gotten past 30 steps (because I rarely lead walk her), the calming effect of the training lasts for a long time.
Stick with it - Soli was just like your littlun when she got here (and she was a 5 year old, 42kg monster then) - jumpnig around, spinning, ragging the lead - she had me in front of traffic more than once doing that. But perserverance and not letting them do it does pay off in the end, it just takes time. Every time she mucks about, stop walking - and if you can reinforce the good behaviour she'll get the idea.
If it helps any, I also found that she was a nightmare on just a headcollar - but what really started her learning was when I started using a headcollar with a harness and a double-ended lead. Two points of contact, if they pull/spin you can lift the leads up and they can't do it anymore, and easier to move them into position if needs be. I'm doing a similar thing with my two newbies - although at the mo I'm just using a harness (halti harness so still two points of contact with the lead). It's made a lot of difference already - doubly helpful for me as they are far too sensitive for most treats so as yet, I haven't been able to start clicker training them.