It really does look like a collar scratch and not an itch scratch. Does he continue scratching after collar is removed would define it for sure... Impressive results on the tap and turn!
Yeah, but he also scratches prong collar and he scratches the collar itself, when it's not being used, not just the ecollar stimulation box. Anything he feels pressure, he scratches and he also does it just hanging out in a down. Some dogs scratch, others shake, others don't care. All different variations. A bath will help, but he'll always do it to some degree, especially if it's allowed to stop training for him to do it. It'll lessen over time with work, but he always will some.