A system and method are disclosed for tracking animals, which may include production animals as well as pets. The system and method may comprise a tag system that is attached to an animal that generally has at least a near-field-communication (NFC) tag. The tag system comprises at least an NFC tag and a radio-frequency identification (RFID) tag. For NFC tags, such tags may be read with a portable computing device, such as a mobile telephone running NFC reader application software. The phone may communicate with a communications network and ultimately a computer server in order to relay information received from a respective electronic tag. The electronic tags may be fastened, embedded, or ingested by an animal. The electronic tags may be part of a mechanical coupling. Each mechanical coupling may comprise a different structure depending on the whether the tags are fastened to, embedded in, or ingested by the animal.