She is delightful!

I'm biased toward black dogs but she looks like she is very sweet.

Our family dog was the runt of the litter and was very timid until puberty and then she became very dominant toward other dogs/strangers. She was not proactively aggressive but she had major alpha dog issues. She would dominate almost any dog in her yard, even if they were bigger.

She did not, however, show aggression toward any of our family and we could easily take away her food, etc.

So she may end up to be a lovable but good guardian!