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I have read that the chips can slide around inside the animal, and once they have done that, apparently the scanner does not pick them up because they are not scanning the correct area; so then the chip actually does no good at all, and could even be uncomfortable for the dog, depending on where it slides to.
Also, even if the vet can scan the chip, if the owner has moved and not kept their information up to date, then there is no way to contact the owner to let them know that the dog has been found. So, if they have given the dog away, and not bothered to change the info with the vet where the pet was chipped, the whole thing is useless.
I do not think that chipping should be required for pets, and I also agree that it simply a step towards marking everyone, and every animal.
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