petGuy, don't beat yourself up. We have had all of ours done by vets and I always see slight movement afterward, too. I don't think it's there--I think we
know the way our little guy should move and exactly what that motion would be like and our brains do the rest. The movement was very slight, and oh-so-quick? Random firing of neurons, maybe. Maybe even wishful thinking, hoping there is more time? The vets knows me--they give the stethescope so I can hear (or not hear) for myself.
They're always gone.
So put it out of your mind.
Techs can be just as skillful as vets and there's no reason to think that your dog suffered.