A chip must be implanted for a dog license. This is because the chip can record the dog's identity information, including the owner's contact information, etc., to facilitate management and search for missing dogs. In addition, the chip implantation is a safe and painless procedure that does no harm to the dog's body. If the chip is not implanted, it will not be possible to apply for a dog license, which will also affect the health and safety of the dog.