We got Miley 2 weeks ago from a shelter. She's about 4 months old and 19lbs...trying to figure out just what she is!
I have no idea, sorry, but whatever Miley is she looks like a really sweet little girl, and well done for rescuing a shelter pup.
As we don't have the Black Mouthed Cur in the UK, I really wouldn't like to hazard a guess. She does look like the pictures of them on Google, though I don't know about the size range. You could try doing a dna test to see which breeds she carries, but I would just accept her as a pretty crossbred puppy.
She looks so much like my new puppy that I just got from a shelter. She was a stray in Texas 3 months old and 18 lbs. I was also thinking she was a black mouth cut, Rhodesian, and boxer mix.