I have 3 dogs one of which is a Karakachan, he has never yelped or wimpered even when one of the others that I rescued was when they first met him was so afraid, and he was so interested, that he came away from the initial meeting with a very damaged muzzle.
The only time he did yelp was when I tried to remove some of the "sticky grass" from his ear, thats how sensitive a dogs ear is