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Dusty was playing chasing games at a friends property. She would run past the older dogs and take off as though they were chasing her. They weren't.
Choosing and training a puppy for agility, herding, obedience, and companionship.
Trent captured Dusty and I discussing how we were going to handle the flock - left up to her she would only go anticlockwise.
Once we had sorted out our handler paths and body language even the young dogs had no problem with the sequence.
With Thommo I do a stand stay. This seemed to be the position he was most comfortable with, probably as a result of playing Ready, Set, Go games where he would be standing beside me, and of many hours of him standing and waiting while a threw a ball, then gave the OK to fetch.
With Dusty I'm using a down stay at the start, again because this seems to be a default behaviour for her, and one the first stay we learned as she needed to do a down stay in the presence of sheep to get her Herding Instinct Certificate. I guess I could insist on a sit-stay with either of them, and work to reinforce it and proof it. But why not start from a position they are already comfortable with.
There is some debate over what is the fastest start. Nancy Geyes recommends a sit-stay, saying that she finds it easier to teach a reliable, square, sit-stay, than a stay in a stand or down position. Chris Zink says that dogs that are left standing at the line first trot and then have to shift into a canter before jumping (jumping is an extension of the canter). This wastes some time and also makes it more difficult for the dogs to judge the correct take-off point. In contrast, dogs that are left sitting go straight into a canter and are ready to jump without having to shift into a different gait.
This may be true where the dog stands flat footed, or lies down belly on the ground, but my dogs wait in a sort of crouch: Thommo in a stand slightly lowered, Dusty in a down slightly raised. Most herding dogs adopt this sort of pose in a wait.
Greg Derrett advocates a standing start. He also says to have a routine which incorporates the dog's natural behaviour. He brings the dog to the start line then stands them with a gentle scruff.