Does anyone recognize this lost pet?

Found this female dog resting on a front porch stoop of a currently vacant townhouse. None of the neighbors recognize the dog. Appears to be scared shitless and dirty like it has been sleeping outside for multiple nights. Seems that it may have an leg injury. No tag indicating ownership. Otherwise, very friendly and accepted water in a bowl. Called 311 and they said someone should be around in a few hours to check on it. Throwing a long ball that someone may recognize a lost pet.