Gall milfeddyg, nyrs milfeddygol neu berson cymwys yn gallu cofrestru ac adnabod cŵn drwy osod trawsatebwr neu ficrosglodyn o dan groen yr anifail. Mae gan bob microsglodyn rif unigryw a all gael ei ddarllen gan declyn darllen allanol a chaiff rhif y microsglodyn ei gofrestru ar gronfa ddata fasnachol fel arfer. Golyga hyn fod modd i awdurdod priodol dderbyn yr wybodaeth angenrheidiol.
Identification and registration of dogs can be achieved by a veterinary surgeon, veterinary nurse or qualified microchipper inserting a transponder or microchip under the animal’s skin. Each microchip has a unique number which can be read by an external reader and the number on the microchip is normally registered with a commercial database, which can then be accessed by an appropriate authority.