I won't mark you down for not having a human, but it's not much of a portrait, since it's basically a nose shot since it's taken so close with the upturned nose. I'd recommend moving back and wait 'til the bitch looks at the camera.
"My, what a big nose you have!" No, noone said the portrait had to be human. The swirls in the fur are great. You haven't lost the detail with over exposure.
You are 100% percent. Female is not limited to humans. I think this she must be a very good friend. I think I would have gone for a little longer focal length lens for a more natural look.
Here we go, another dog, as in every challenge. Someone always enters their dog or at least the cat - independently of the challenge topic. I understand that you love your pets and like to take pictures of them, but please, this is supposed to be a challenge...
So: DNMC, this is clearly not what was meant. According to your interpretation you could submit an image of any animal. And many languages even assign genders to objects, which opens another wide area.
I think you should not have submitted this image. It does not get the score it would deserve in a challenge it meets, it hurts your overall score, you annoy voters and the other participants (who took the time to take a picture according to the challenge assignment) get less votes and comments.
I disagree... a portrait is the facial image of a person... unless specifically referring to the likeness thereof. Nice picture of your bitch. Maybe if they said the portrait of a bitch... or portrait of a house or a camera.