Remixed the excellent work of Rephlex00 to suit my need. I simply elongated the tabs that hold on to the collar so they'd hang on to it more. As originally designed my 55lb pitties shake the AirTag off when they shake their heads side to side as dogs do.
STL included showing my change. Gcode sliced for Mini+ printed in ASA with supports only to bed to support the longer tabs.
The author remixed this model.