The microchip is injected under the skin and into the connective tissue of your dog with an instrument much like a hypodermic needle. It is no different than having your weim  vaccinated, the process is quick, simple and causes minimal discomfort.

Once injected under the skin of an animal, certain microchips are encased by a thin layer of protein which anchors them in place for the rest of the life of the animal. It does not pass through or out of the body. The microchip itself has no power supply to replace or moving part to wear down. Therefore, it can be expected to last for decades - well beyond the life span of the animals.

The computer memory in the microchip contains a unique number - no two animals will ever have the same number. A radio signal is used to read this number through the skin of an animal. In addition to the number, the microchip generates a reliability check to guarantee that the identifying number is read accurately. This all takes place in less than .04 seconds.

for more information on microchips and identification please refer to the Canadian Kennel Club: http://www.ckc.ca/scoop/chip/

also http://avidcanada.com/thechip.htm for more information on the AVID microchips.