Washington (AFP) – The routine is now a familiar one: Open the kit, swirl a swab around, put it in solution and wait impatiently for the results. Except this time it’s not a test for Covid — it’s a DNA test for dogs. The kits, which are used foremost to learn a dog’s breeds, first appeared some 15 years ago and their popularity has since exploded in the United States, where nearly 40 percent of all families have at least one canine companion. “Having a dog and integrating them as a member of your family, you want to know where they’re from,” said Mila Bartos, a Washington lawyer. One of the m…