Lost dog around my house

Hello everyone, I just saw this dog trying to get something to eat from the trash cans close to my house. I went to buy something for him to eat and I gave him water. I couldn't take a better picture because he ran away after he saw me take out the phone (He did finish the food I gave him and drank water) I can't keep dogs in my place or else I would be happy to help him. What should I do? He was shaking from the cold... This was in McElderry St in front of the Amazing Grace Church