WOW
This is definately the most emaciated live dog I've ever seen.
Which has already been said. But....
I am posting to fill people in on other possible reasons this dog could have become this way. Yes, there are evil people out there. Chances are very likely, had this dog been removed from someone's improper care - the rescue would have been told the story.
When the dog is listed as a stray and comes into the shelter this way, it certainly did not have the strength to escape inhumane treatment. More than likely it wandered the streets (yes, due to human neglect for not watching their baby close enough ) but since the dogs mother did not show it how to hunt and perhaps was in an area where garbage was not plentiful or the dog just never learned to survive on garbage, I can see this happening. After a time, the dog becomes weaker and weaker, basically hiding while sleeping, furthering it's starvation due to lack of energy.
I think this is how really "good" dogs get into rescue. Not mistreated physically always - just escaped while someone wasn't watching, maybe it even hopped a 6ft fence?
My foster right now, Carl, was emaciated and extremely clean when he arrived at my house. Since I've had him, I notice he likes to entertain himself by keeping himself clean.
Looks like this little girl has a few months before she's back to the dog she really is.