I have had one out of many AVID chips migrate/malfunction. This was a chip that was inserted in 1998. According to the veterinary sources that I use, the Avid chip has been redesigned such that it would allow surrounding tissue to better secure it. In my particular case, we discovered it prior to doing the hip and elbow rads. I had 3 vet staff, independent of each other, scan the dog -- to no avail. We inserted a new (AVID) chip and took the rads. I have had not migration or malfunction problems with that chip or any other since. I microchip all my dogs (in case they are lost) and I DNA profile them (in case they are stolen). I also chip my Chocolate Point Siamese cats.
As a matter of good practice, I always have my vet scan my animals at their annual wellness physicals to insure that everything is working properly. Nancy Melone, Ph.D. Mars, PA
