The chip’s only as big as a grain of rice. It’s usually implanted in the scruff of your dog’s neck and doesn’t cause any pain for your pet. And it only costs around $25 to $50, depending on your vet.And how a microchip works? Basically, from the technical point of view:
A pet microchip uses radio frequency identification (RFID) technology. RFID, as the name implies, uses radio waves as a medium to transmit information. An RFID tag stores data and, using electromagnetic forces for power, communicates that data to a device that interprets it.Read more: http://science.howstuffworks.com/innovation/everyday-innovations/pet-microchip1.htm I think, that microchipping should be obligatory in all countries - it is 21 century that we live in. Not only does it help when lost dogs are identified, but also it helps fighting the people who abandon their dogs. I hate the thought that somebody is capable of abandoning their dog, nonetheles, such cases still do take place. http://pets.webmd.com/features/microchipping-your-dog-or-cat - here you can find even more information on microchipping pets
WebMD veterinary expert answers commonly asked questions about microchipping your dog or catTo conclude, microchipping is not expensive, it is not painful (this moment of injecting the small object under the skin is very short), and it is incredibly helpful in cases when animals run away or are lost.
the picture comes from http://science.howstuffworks.com/innovation/everyday-innovations/pet-microchip1.htm