hello you should check local stores and animal shelters and put up a found dog sign in common places if no one calls or comes for him in a week he is probably a stay :( if so you should keep him or take him to the pound :( best of wishes
My dog had the same thing it is either possably a ear in fection my doggie we took her to the vet he had to drain it, it could also be in infection if so she will be fine if you do not delay to get he/she to the dog hospitl a day or 2 will be fine bu...