It's basically an electronic ID card. It's injected into the skin.
The original practice was to prevent owners from abandoning their dogs. Stray dogs can get their owners' information by scanning the chip.
But the chip shifts as the dog ages. Back of the neck, heard of some will move to the elbow chip is the dog and the owner of the discriminator!! Because once the chip is implanted in the dog's body, it will remain in the body for life, if the dog is lost, you can find the owner through the chip, even if the dog is stolen, you can identify the owner through the chip, so that the other party can not play!!
It is a chip that dogs need to hit when they get a dog license, which stores the information about the dog's vaccination. You need a chip to issue a dog license