“The BSAVA (Bristish Small Animal Veterinary Association) instituted a microchip adverse reaction reporting system in 1996. The unified microchip registration database in the United Kingdom, petlog, reports over 4 million animals have been microchipped and only 391 adverse reactions have been reported. Of these reactions, migration of the microchip from its original implantation site is the most common problem reported. Other problems, such as failure of the microchip, hair loss, infection, swelling, and tumor formation, were reported in much lower numbers.
There have been reports that mice and rats developed cancer associated with implanted microchips. However, these strains of mice and rats are used for cancer studies, and are prone to develop cancer (which is why they are used to study cancer). Tumors associated with microchips in TWO dogs were reported, but in one of the dogs the tumor could not be directly linked to the microchip itself (and may have been caused by something else).” -From the AVMA website (see the link below)-
In summary, thats two dogs in 4 Million animals. Even including the one dog that could not be directly linked. That is roughly a 0.00002 percent chance of getting cancer from a microchip. The chances of losing your pet are much greater. At our practice the first thing we do when see a lost pet is, scan them for a microchip. This is a practice carried out by all shelters and veterinary practices. There are numerous stories of lost pets traveling hundreds of miles only to re-united with their owner thanks to a microchip.
“Dogs have been reunited with their owners years after they were lost, based on the detection of an implanted microchip. Dogs that were found 600 and 1000 miles from their homes were reunited with their owners due to the presence of microchips. In 2007, actress Vanessa Williams was reunited with her dog due to the presence of an implanted microchip” -from the AVMA website
In my practice career, I have never seen a microchip associated with a tumor, and with the above percent its easy to see why. A microchip’s risk is greatly out weighed by its benefit. I recommend microchiping you pet. My own bulldog “Newman” is microchipped.
If you would like to read more about microchips the first paragraphs of this discussion are from the AVMA website at the following link…