GPS collars are used when you know, or expect to know, that your dog is within a such and such mile radius in a forest and you need help finding it recover it.

GPS collars are used when you know, or expect to know, that your dog is within a such and such mile radius in a forest and you need help finding it recover it. They're for when you're out hunting or hiking with an offleash dog and it takes off after a prey item, and you lose sight of it. Since AirTags rely on Bluetooth and the cooperation of other devices, they're not that useful in some of the situations where you want a GPS collar. If you're worried about a dog getting lost around people, something like an AirTag might be a good addition to your dog's microchip, though.