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I can say this. I have seen more lost dogs found by owners from sharing on Facebook and or Craigslist. Pretty powerful medium and I don't know a dog owner that doest "share" lost dog posts. 2c
Bango, any vet or shelter will scan them for a microchip for free. Good luck finding their folks.
Okay, no pound, cant do it. Im sure they were abandoned, but ill try to find the owners. They will have a good home in the mean time, permanently if need be.