They stack the dogs for shows…this is a showstack only without a leash..so free stack;) I’m teaching Ivy the free stack again…think it’s prettier on the show. Then you dont have to stand to the side .
It’s different for every dog. Some also just don’t like this way of stacking so you have to use another method.
On youtube there are also video’s of how to do it.
I just practice sometimes by stacking Ivy when we are on walks and walking a bit further while she is still standing. You can use a command if you want. Ivy has been in the showring from when she was 4 months old so its easier to learn.