Found dog with breathing issues

I found him in Port Richmond, about a block from the library. Tried a few doors, no one answered. He's panting and coughing a good bit, very overweight. He definitely needs to be checked out by a vet but I do not have the money for that today. Any advice on where to take him? I'm working on posts for Facebook and nextdoor as well, but I don't know how long he was outside and he's definitely overheated so that's my first priority.