Branding gave way to physical plastic tags mounted on the animals in holes made in their ears specifically for this purpose, Though! identification was still done manually.This was the situation for cattle and other commercially raised animals and there was no system however for pets too.Therefore pet owners always had problems when it came to identifying lost pets.
Injectable RFID tags are now available.They are injected to remain under the skin of the animal while delivered through a special syringe, their advantage is that they are less painful also there is no outside identification mark for a malicious person to know where the tag is embedded in order to remove it or modify it.The RFID chip inside the tag is generally 'Read-Only" so that data once recorded cannot be modified.
a. Was not painful to the animal.
b. Visible only to an RFID reader.