Veterinarians serving Norwalk, Westport, Darien and Lower Fairfield County

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330 Main Ave., Norwalk, CT 06851

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Microchipping

A microchip is a tiny transponder, about the size of a grain of sand, that is encoded with a unique identification number. It is used for permanent identification. The technology is relatively recent, but is becoming widely available.

Before insertion, the sterile microchip is scanned in the package to confirm that the identification code of the transponder is the same as that shown on the package bar code label. The needle containing the microchip is loaded 'into the application gun or syringe, and the pet is positioned for the injection. For dogs and cats, the standard site for microchip placement is in the subcutaneous tissue along the dorsal midline (the spine) between the pet's shoulder blades. For correct placement, the pet should be either standing or lying on the stomach. Some of the loose skin between the shoulder blades is gently pulled up, and the needle is quickly inserted. The applicator trigger is depressed, injecting the transponder or microchip into the tissues. Once the chip is inserted, the pet is scanned to ensure that the chip is reading properly and the identification number is checked. It is now a permanent and tamperproof method that cannot be lost.

The procedure is fast, safe, and appears to be relatively pain-free in most pets. The chips are usually inserted without incident, even in the tiniest kittens and puppies. The application needle is quite large, and some clients will choose to have the microchip implanted at the time of sterilization, so that the pet can be anesthetized for the injection. However, this is not necessary, and the microchip can be implanted at any time that is convenient.

Once your pet is microchipped, you must register him or her with the appropriate agency. Your veterinarian will provide you with the relevant documents and contact information and will tell you if any fees are required. Failure to register your pet's microchip identification will render the entire process useless. If you move or change your contact information, be sure to update your pet's microchip information. If your pet is lost and recovered, this information will be used to reunite you with your pet.

The microchip can be 'read' with a microchip scanner, which detects the specific 'electronic code embedded in the chip, and displays the identification number on the scanner's screen Since the occasional microchip may migrate, or move out of position, the microchip reader will be passed over the entire body of the pet in order to ensure that the chip will be detected if present. Most, if not all, humane societies and animal shelters now have microchip readers, and routinely scan all stray and injured animals. Steps are being taken to standardize the readers and develop databases that can be readily accessed.

Collars and tags can break, be lost or be removed. When the tags are new, they are easy to read. However, as they get old and worn, it can become challenging to make out all the information that is on them. Tattoos can be difficult to read. They are commonly placed in the flank area, where they can be obscured by hair. Even when they are in the ears, they can become faded over time. They can also be readily altered. Even when they are readable, the information about the pet and its owner can be difficult to obtain. Microchips cannot be easily misread, and the identification number is tamper-proof. The information about the pet and owner is usually readily retrievable.

This client information sheet is based on material written by Ernest Ward, DVM.
© Copyright 2005 Lifeleam Inc. Used with permission under license. June 13, 2007.

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