As a practicing small animal veterinarian, I have implanted many microchips and have never seen any associated problems other than the animal being quickly returned their owner if lost (can that be considered a problem?) Doing a little research on Veterinary Information Network I found that in over 10 million plus microchipped animals there have only been 4-6 documented cases of sarcomas found in dogs and none absolutely linked to microchip in cats. There isn't any hard real evidence that microchipping causes cancer and the benefits far outweigh the "risks". My $0.02 worth (for what it's worth)
Terry Beatty DVM

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