Domestic dogs and wild wolves have been breeding in the wild for hundreds of years and it has left a genetic mark on the wolf gene pool, a new international study has revealed. The study examined DNA data from grey wolves – the ancestors of the domestic dog – to determine how much their gene pool was diluted with the DNA of domestic canines, and how widespread the process of hybridisation is. Science... Is a Dog’s Coat Colour Linked to a Wolf’s DNA?