As I have posted in the past, I have a Tank dog that was washed out because of whining. Not while sitting on the line and marking, but after being sent. To most trainers this is the hardest fault to correct because the dog will not be able to interpret the correction properly. Was he nicked for leaving to fast? Wrong line? Going too slow? Just what does the dog think the correction was for?
The only way I was able to stop this from happening, was to teach him primary selection. When he wasn't sent immediately for the LBD, and had to re-focus on another mark, his whining stopped.
While this doesn't amount to much of a markdown in a hunt test, it's hard to say where it will manifest itself as time goes on and the dog is allowed any type of vocalization. All noisyness in a hunting dog needs to be stopped as soon as possible, or it just gets worse, to the point of the dog becoming useless.
That's why I think that fault is the worst of the group, Peake. It's the most difficult to correct.
UB