Thanks for the advice everyone.
I didn't have time today, but I will get him scanned at my vet tomorrow.
I will be searching for his family... I have been checking Craigslist for the past two hours, but his family may not even notice he's gone yet. The area I live in, there are a lot of small dogs running rampant. It is the culture of the people I live around.
I'm honestly hoping no one searches for him because I don't want to give him back to a family that allows him to run free.
I know I could be wrong, but the fact that he is unneutered, no collar and matted leads me to think he is not taken very good care of.
I know I would be crushed if I lost either of my two... But they both have nice haircuts, collars, are chipped and fixed. I just think all dogs should have as good of a life as my two