Our recommendation: You should absolutely use both a microchip and an AirTag on your dog. You want to increase the chance to find your lost dog as much as possible. The AirTag does everything that the microchip does, just better. The reason we don't recommend replacing your microchip is the following:
Microchips have been the standard for finding your lost dog forever, and it will never hurt having one. The worst thing that can happen? It doesn't help to find your lost dog.
We're confident that we offer the most elegant solution to put an AirTag on your dog.