I can't believe I'm reading a post on huffing!
I was just thinking about that this morning when we
came in from our walk.
Buddy "Huffs" when he is told to do something, like sit
so I can remove his harness. He huffed at me because
he wanted to run through the house when we came back
in and I told him to sit! When he's annoyed with
me he actually "Huffs". Drives me up the wall. A dog
has the nerve not to have patience with me.

Who would believe such a thing?
Sounds like your little one is not much different.
They are just too smart for their butts.