SrDogTrainer--well, no, it started a couple days after the shots. But, today she was back to waving wonderfully....maybe she just wasn't in the mood, lol??? I don't know. And today she really had an off day, so it was kind of funny that she waved just as good as before her little anti-waving episode. Who knows...?
Reveuse--adding distance to the wave...he quits soon as you literally move an inch further than he's used to? If that's the case, you can do a few different things:
Go back to using a target, if you used this to begin with. Move the target in teeeeeeeeny tiny increments once you get to his point where he will no longer respond to it.
Since he's a small dog, I'm guessing you're bending over if you've been teaching him to target your hand. There's a good chance that you bending over has become part of the cue, so he thinks you standing straight means no wave. Try sitting on your knees, but sitting up straight, or gradually going from bent to sitting straight up. Then try squatting a little, then standing, etc. Can't remember which book I read it in, but it's good to get your dog to listen to commands from literally any position--whether you are laying down, standing up, sitting down, standing on one leg, etc.
You could also try practicing it many many many times in a row(without him getting bored), just like you normally do--hand right in front of him if that's where it normally has to be. Then sit with clicker and treats and wait. See if he offers it--if he does, jackpot, because you weren't in the position you normally are to signal the wave. Kind of using shaping to mold a known behavior into a more what you want.
Right now I'm working on having Mud sit beside me to wave, instead of facing me to wave. Any other trick she does fine without facing me, but the wave she had a little more trouble with initially. She's pretty much got it now; just took a couple sessions, but still needs a wee bit of work.
Tongue-sticking-out command ideas....
"What do you think of Cesar Milan?"
"What do you think of vegetables?"
"What do you think of [other various public figures, training methods, sports teams, etc]?