When it comes to GPS trackers, Spytec has the best. They need to be recharged every 10 days or so and you have to pay a monitoring fee of about $25 per month. You can track it on computer or cell phone. It shows current location and history, both map and landscape modes. Spytec support is just the best.
See about using a tracker device like the vets put in a dog...???? Give it a try, you don't know 'til ya know...
You can't track a pet chip but you can prove you own what is embedded with the chip. There is one cue maker that did this in the past. If you don't have a rifd reader you have to go visit the Vet and use his.