What is the maximum distance the AirTag can track if I lose my dog?

The short & long answer is an unlimited distance. Given iPhone's virtually unlimited network, you'll be able to tap into every Apple device that opts into the "Find My" network. This makes for effectively a pet-microchip from the future, where not only is everyone nearby notified of your missing dog (the AirTag), but can also easily notify you. Your dog can run far away, but as long as he/she is near one device, the location has a higher chance of being marked.  Click here to know more about #airtag dogs.