NEGLECTED DOG...what can i do?

Everytime I walk my pup around our apartment complex I pass by a certain porch with a dog locked out on the porch.This is literally EVERYTIME i walk by(sometimes 3-4 times a day). She's hunched over in a corner(these aren't large porches either) because her feces and urine COVER the ground. She seems to be fed on a regular basis but RARELY has water and down here in Alabama it gets dangerously hot during the summer. She's completely listless and when we walk by and Nico goes up to sniff(you can smell the porch from 30 yards away) this poor pup wont even raise her head.I'm not a dog expert but I know thats not normal at all. I don't know if she's sick or dehydrated but she is definitely kept in unsuitable conditions. The feces and urine havent been cleaned off of this porch in over a month and I cant walk by anymore without doing SOMETHING....what would yall suggest???