I had a Lhasa rescue that seemed rather stoic and non-excitable but he was very sensitive and seemed to pout for quite a while if he was scolded, a few days maybe.
One time I scolded him for peeing in the house and when I left he went and peed right in the middle of my bed, lol! It was a long time ago, but I think he adapted to us after a while.
I had a mixed breed rescue that would growl when anyone approached me, and even growled and snapped at me when I bent over to pick up my yarn. It scared me and I told them she needed more fostering before she was ready to be adopted. I didn't want anyone getting bit!