There are hav been a couple of threads about this recently
The heltec v3 is nice, but lacks GPS. Although one can be connected.
For not much more than the generic Lora v3, can get a similar device but features a GPS
I’ve been experimenting with these as trackers, and so far they pretty good. Much more compact that most other meshtastic devices that include a GPS.
Only needs a case and a battery (and lora antenna!) . A 1000mha battery is similar size to the device, and gives 24hour battery life.
There is also these
which on paper should be perfect (a sealed unit and easy to attach to dog coller/harness, with GPS)
… but it seems still early days how well these work with meshtastic, what sort of battery life they get (the specs oversell it!) and how well the integrated antenna works.
… plan to get one soon, to try out and intend to try it out for on my dog, which does like run!