@bellabasenji:
Bella is micro-chipped, but my fear is that who finds her doesn't think about the fact she may be chipped. Also, not all vets/shelters have ALL the various chip scanners…
I believe that they can at least tell a chip is there. My beagle had a different kind of chip that my current vet couldn't read like their own chips, but it did give them the manufacturer and a number which could be used to help track it down. Unfortunately, my beagle's chip had migrated down his back so if they were looking in the usual place my vet wouldn't have known it was there. Supposedly, chips don't migrate like that anymore. Nemo's has stayed in relatively the same place.
Spurs1, if you don't have a chip and and are planning to get one, make sure and register the chip. I've heard a number of stories where people have not and the lost dog ends up being adopted out because the owner cannot be identified.