Home Again Pet Recovery System

Home Again Pet Recovery System, manufactured by Intervet, a division of Merck & Co., is one of a number of electronic pet tagging systems used in the US. Much of the rest of the world uses similar chips based on ISO 11784 and ISO 11785, instead.
A 125 kHz RFID transceiver with a unique identification code is implanted between the shoulder blades of the cat or dog. For other species the chip may be placed elsewhere, for example between the breastbone and the breast muscle in birds. As with similar pet identification systems, a code is stored in the implanted chip that can be looked up in the HomeAgain database to determine the contact information of the pet's owner.
The brand was originally owned by Schering-Plough; after its merger with Merck & Co. in 2009, it became the only brand to attain the Intervet name.
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