I AM A GIANT.
This is the classic hand signal for "sit". My right arm will bend at the elbow and be raised straight up, with the palm facing up. This is similar to the motion I made to lure him into a tuck sit, and he already responds to it (if he is sitting directly in front of me, where the camera is).
This is my improvised stand signal. Technically he doesn't need to be able to respond to a stand signal at a distance for obedience, however I will teach it so that he doesn't just switch between sitting and lying down when we're practicing signals. To prevent unwanted anticipation in competition, the dog must be really watching your cues and responding to each cue, rather than doing what he remembers comes next.
Dragon already has a hand signal to stand but it is messy. I will stop using it and switch to this one.
Down. My previous dog responded to my arm bending up and away from my side as a down signal because I would raise it up to the side and then bring it down in front to lure the down. He started to anticipate the second part and respond to just the arm going out sideways. (This is wanted anticipation!) I like this because it means that I can easily signal all three positions with just one arm. Dragon responds well to this signal. Roughly half the time he lies down when my arm is out to the side and about half the time I have to finish the signal. When I bring my arm down I also push it forward and down toward him, as this reminds him to do a fold-back down instead of crawling forward into a down.
So this all looks great, right? But then I thought about my "spin" signal:
Looks a bit like the "stand", doesn't it? I think this is actually a red herring, though. Dragon is very reliable with the verbal for "spin" so I don't use the hand signal that much. When I do, I keep my hand lower and make a little twirl with my finger. For the "stand", my hand will move toward my stomach in a different way and the hand will be held in a different manner. I expect any initial confusion to fade very quickly. Still, I will be ready to change the "stand" signal if it proves to be a problem.
I haven't decided on a distance signal for coming to front yet, but it will have to be with my left arm so that it doesn't mimic any of these other motions. My left arm will also be used to signal a left finish into heel position, which naturally tends to be a sort of "bring the left arm out and back" movement. My "front" will have to be clearly different, so it will probably involve raising my left hand toward my chest or my head.
Oh yes, there's also the right finish to think about. I could move my right arm backwards or, to avoid adding too many signals to that side, I could simply turn my head all the way to the right. If he's already sitting in front and looking up at my face, this will be a clear signal for him.
...Or will it? I will have to take more pictures to test that theory.
A few extras:
"Turn", the opposite of "spin".
Weave between my legs.
Hop over my foot. He gets these two confused sometimes, because we had practiced leg weaves a lot before I introduced the "hop over my foot" trick, and the reinforcement history wins out. He's improving steadily, though.