Captain Midnight Sugar Dot Express Boyette?

Yesterday I was driving the kids and Kaa and Big Paul (Adam's godparents) home from basketball practice when we saw an elderly lady standing on Granbury Rd. crying.  That's a major road in Fort Worth, so we were trying to figure out what was wrong.  Then we saw a tiny black Chihuahua dodging cars.
The dog was running fast, and we followed him with the car, but when he crossed the street, I pulled over and started chasing him.  Kaa said it looked like I was a track star.
Traffic stopped and I chased the dog across Granbury and down the railroad tracks.  I finally cornered him under a bush and then Big Paul appeared to help.  With the help of a leash from a neighbor, and a few bites, we got a hold of the dog.  I was so happy to help a little old lady get her precious baby back.
Panting as if it was our last breath, we walked the dog back toward the elderly woman.  Turns out, she was gone.  Apparently it wasn't her dog at all, but she was the first one to nearly hit the dog with her car and she was upset.
So now we're hunting for the owners of a precious black Chihuahua, whom the kids have named Captain Midnight Sugar Dot Express Boyette.  We've been to Petsmart and verified he does not have an ID chip.  We've been to the local vet who doesn't recognize him.  We've posted signs around the neighborhood.  I can't say that we are looking forward to finding his owners, because we've grown attached.  If there's a family looking for him, we'd be glad to return him, but if there's not, he's got a home here.