The first microchip available was the AVID chip i believe that that is the scanner that most shelters have. Now there is also the home again chip, and scanner. The home again scanner will not read the avid chip numbers however it will tell you that there is an avid chip in the dog, then the vet/shelter will know about it and they will find the avid scanner to use. The avid scanner also will not read the home again chips but it will tell you something is there. I believe there is a scanner out there that will read both chips but its not regularly used.
I think its a good idea to have your puppy chipped now adays with all the dogs being stolen. shelters and vet's offices do scan them, or at least the vets i work with scan them, when people come in saying they found this dog and are going to keep it..
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