Aww congratulations!
My lil puppy would bark back at me when I told her no.
She grew out of it. Well, sorta. Now she looks at me when I say no, either she'll walk away, or she'll look at me while doing what I told her not too!!
Then when I tell her no again she does this thing that reminds me of a human going HMPH FINE (jerks her head away from the object) and walks away.
Good luck with your fur baby!