By "tracking", do you mean being able to check remotely where your pet currently is, or simply record its current location to some kind of storage, and being ab

By "tracking", do you mean being able to check remotely where your pet currently is, or simply record its current location to some kind of storage, and being able to review that once you have physical access to the device? I.e. are you concerned about your pet getting lost, or do you just want to know where it has been? If it's about remotely checking, then you will need some kind of communication, which is most likely going to be cell phone related (i.e. GSM, UMTS, LTS...). A GPS device does not send anything to the satellites, it merely (as a simplified explanation) receives time codes from multiple satellites and triangulates the current position from that. If you only want to record, then GPS alone would be fine, obviously. Though there is "Assisted GPS" that makes use of cell phone technology to increase the accuracy/decreases the triangulation time. However, I do not know whether that can be leveraged from standalone GPS modules.