Microchipping or tattooing your dog in France

In France it is compulsory now that dogs have a tattoo in the ear or have a microchip inserted beneath the skin around the neck called a puce. If a dog is being advertised one must gave the identification number with the advert [so after being told I have added that to Angus advert ] There are at this moment 300,000 lost dogs in France. 170,000 dogs are left at refuges each year. But the good news 100,000 dogs each year are returned to their owners because of their microchips.