Thank you for your responses! I certainly feel that the risk of losing a "runaway" dog far outweighs the risk of cancer from a microchip - as you mentioned before, the numbers of animals unaffected by placement of a microchip are vast, and the cases of animals with problems very tiny. The number of dogs that escape from a home, kennel, or enclosure each year are high. Any way to bring them home safely is very beneficial. In some instances, microchipping is sometimes required in the US, such as in the case of importing a foreign bred dog, and registering with the AKC, replacing the tattoo as a permanent identification mark. I guess reading the article - it was posted on CNN as a headline yesterday - just caught me by surprise. My son passed away from cancer earlier this year, and now we have very "sharp-tuned" ears for the word "cancer" - probably too much so! Again, thank you for your clarification.
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