As far as I know and I'm in Canada so it may be different in your coutry.
The vets and humane societies (maybe not small small towns but most towns) have scanners. There is no charge, this makes sense because it's usually only a few hours from the time the dog is picked up until the time the dog is home again, thus preventing the dog needing shelter, medical costs or food at the humane society. Saving money all around.
There are from what I know 2 different scanner systems. I think on is North American and one is Great Britian or something like that... but it's a fairly safe bet if you loose your dog in Ontario and he's found in Buffalo, if he's microchipped they'll be able to get him back to you.
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