Today we have a special broadcast on World Dog Day, a day that Spain, Mexico and some Latin American countries celebrate every 21st of July. We speak with zoological consultant and science-writer Jules Howard, author of the book ‘Wonderdog: the science of dogs and their unique friendship with humans', which was translated into Spanish earlier this year. He'll tell us about how dogs have evolved throughout history and the special bond they share with humans. We'll also catch up with the great results of the latest edition of 'Healthy Cities', a challange promoted by health care provider Sanitas.