The most advanced GPS dog tracker I've tested is not an AirTag and is $28 through Labor Day
Briefly

The Petcube GPS tracker is a solution for pet owners seeking peace of mind with real-time tracking, geofencing features, and safety alerts for their dogs.
This device offers additional features like a waterproof design, LED light, and beeper, though it requires a monthly subscription for tracking functionality.
While effective, the tracker may be too cumbersome for smaller dogs and relies on a subscription model starting from $5 per month for continued use.
The geofencing feature provides notifications if the dog strays beyond safe zones, making it easier for owners to ensure their pets are safe.
Read at ZDNET
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